New Circuits Page 112
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An output booster is needed when you want to achieve the needed current/voltage gain. Great output commonly need in accociation with the the output power limitation of mostly IC processing. The following figure shows you circuit diagram of the typical....
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When designed with general purpose small-signal transistors, the bandwidth is 50MHz to 250MHz so very careful grounding and power supply decoupling is required. Simulation schematic for 2 transistor buffer. *Copyright Poul Petersen 2009 * *Some standard....
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This is based on a circuit from the superb electronics info pages at. If you want to know more about IR remote controls, from circuit details to data protocols, look there for info (under `remote control`)! This design allows multiple transmitters and....
-
I`ve managed to complete the first phase of my motion-controlled photography rig: setting up a pair of bipolar stepper motor controllers. This is the most important non-mechanical part of the project, as without control of motors there can be no....
-
Nowadays a lot of intercom units are equipped with video cameras so that you can see as well as hear who is at the door. Unfortunately, the camera lens is....
-
This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker. This one is a unit of switches connected into 4 arranged of 4 columns for a total of eight terminals. When we....
-
-
A teardown of a BK Precision 4011 5MHz function generator a few weeks ago. Like most of basic function generators in old days, BK 4011 does not offer frequency sweep as an option. What it does include is a VCG (Voltage controlled Generator) input, which....
-
This Arduino-powered vocal effects box pitch shifts and distorts incoming audio signals to produce a wide variety of vocal effects. This project is my first experiment with real-time digital signal processing using Arduino. It samples an incoming microphone....
-
Function: for people wanting to get tanned but at the same time wishing to avoid an excessive exposure to sunlight. Component: Electrolytic Capacitors, ....
-
Flame Feedback is a sound sculpture built from a speaker driver, a candle, and electronics. The speaker is driven with a low frequency tone, pushing air and causing the candle to flicker. An optical sensor measures the candle flicker and frequency modulates....
-
The Allegro ACS75x family of Current Sensors provides economical and precise solutions for current sensing in industrial, automotive, commercial, and Communications systems. The device package allows for easy implementation by the customer. Typical....
-
-
DC motor drive controller control two DC motors of any current or voltage rating, depending on the rating of the relays. The circuit also provides two shaft encoders for positional feedback to the computer, the motor control circuit is connected to an IBM PC....
-
The filament of a incandescent bulb is the sensing part of the circuit. When there is no air flow the resistance of the filament will be low. When there is air flow the resistance drops, because the moving air will remove some of the heat generated in the....
-
Making a light-dimming control system for a 240V heat lamp dissipating around 250W. I need to adjust the heat output on the lamp by control from a microprocessor. I`m developing on an 8051-based SoC with RF circuitry and some sensors and actuators. Basically....
-
BA5417 is a stereo amplifier IC with a lot of good features like thermal shut down, standby function, soft clipping, wide operating voltage range etc. The IC can deliver 5W per channel into 4 ohm loud speakers at 12V DC supply voltage. The BA5417 has....
-
-
Construct universal power supplies, including: Low-voltage power supplies for operating electronic equipment are in the next section. There you`ll find designs for single- and dual-voltage regulated supplies, including an all-purpose adjustable version and....
-
-
This tremolo effect circuit uses the XR2206 and the TCA730 IC which is designed as an electronic balance and volume regulator with frequency correction. T...
-
-
Here is the circuit diagram of a battery eliminator circuit that can be used as a replacement for 9V PP3 batteries. The circuit given here can be used to power any device that operates from a 9V battery. The transformer T1 steps down the mains voltage and....
-
I have a 89 seris RS232 programmer but my computer has no RS232 connector so where i have to connect rs232 cable Is any converter for RS232 to usb....
-
AD9835 is a DDS (direct digital synthesis) chip from Analog Devices. It contains a phase accumulator, sinewave table, and 10-bit D/A converter. In can be used for phase and frequency modulation by selecting the phase and frequency of the signal either under....
-
The industrial fuel oil furnace controller circuit is composed of the power supply circuit, testing and ignition control circuit and control implementation circuit, and it is shown as the chart. The power supply circuit is composed of the step-down capacitor....
-
TDA7560 is a 4 x 50 watt quad bridge car audio amplifier. The inputs are compatible with TDA7560 soil and can tolerate very high input signals ( ± 8Vpk) without sacrificing performance. If Hz are included as standard input capacitors (0. 1mF), reducing the....
-
The way that this receiver works is very similar to the way that we as humans beings work. We see colors and we act depending on the different things seen. The phototransistors does the same thing, if reacts depending upon the intensity of infrared light....
-
While I`m getting ready to rip open some 10+ broken DVD-RW drives coming to me from an eBay seller, I though it would be great to have a testbed for the bipolar stepper motors I will harvest from those. I have a bunch of ULN2803AG Eight Darlington Transistor....
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Basically I used the parts list that is on the first page of the Make Magazine article. But that list is for the harp which has 6 lasers so most quantites can be just 1. ..
-
The Neumann/Gefell UM 57 was a large-diaphragm tube condenser microphone manufactured by the Neumann company of Gefell, Germany, currently known as Microtech-Gefell. The mic used the Gefell company`s famous M7 capsule. This was a dual-diaphragm,....
-
The circuit presented here may provide a solution in a number of cases, since it can be used to convert a single-ended supply voltage into a balanced set of supply voltages. That`s not so remarkable by itself, but the special feature of this circuit is that....
-
-
Square wave tone bursts is provided by depressing the pushbutton. It`s duration depends on the duration for which the voltage at Pin 4 exceeds a threshold....
-
Here is an ultra simple automatic light switch circuit for bedrooms. After construction, connect the input terminals of this circuit in parallel to the int....
-
-
The Flash MC Programmer II is a fast parallel port programmer for several 40 pin 8051 microcontrollers....
-
If there are more than some 5mV, reduce this offset value by experimenting with resistors (220K a good starting point) from testpoint Z (junction of R22/R23) to +v if there is a negative voltage or to -v if there is a positive voltage until the voltage at....
-
-
This simple DC motor control or PWM circuit using 555 IC can be used to control the speed of a DC motor. The circuit is very simple and can be built in very short time if all parts are available with you....
-
From a SONY double tape decks with model number "SONY TC-W230" I have picked a nice LCD VU-meter. I have decided to add it to my computer tower case. the following steps explain how to do this. this is based on IC lablelled CXD1017 (impossible to find a....
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-
-
LA4550 audio amplifier in BTL configuration. This amplifier can deliver 4W into an 8 ohm load at 12V power supply....
-
-
Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
-
Small and simple unit, Can be used for Home-Security purpose In this fire alarm circuit, a Thermistor works as the heat sensor. When temperature increases....
-
Operational amplifier based triangular wave form generator is simple circuit that is widely used in function generators. Here is the circuit for Triangular wave generator using 741 op amp. We know that the integrator output waveform will be triangular if the....
-
Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your headlight switch to provide automatic switching between high and low beam....
-
Not drive a solenoid directly from your Arduino. It requires more current than you can provide and produces destructive voltages when it is switched off. There is a simple solution. The solenoid I was testing with is a 12 volt solenoid the size of my thumb.....
-
The LED circuit below is an example of using 25 white LEDs in series connected to the 120VAC line. It can be modified for more or less LEDs by adjusting the resistor value. The exact resistance will depend on the particular LEDs used. But working out the....
-
-
Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if a SCSI disk controller is fitted, its activity will not....
-
This is a compact, easy to build amplifier that uses one IC only but delivers 40 watts of audio power. It is ideal for amplifying audio from your mobile CD player or iPod. The chip being used here is the TDA1514 originally brought to the market by....
-
In binary phase shift keying (BPSK) modulation scheme, the phase of a carrier is changed in accordance with the digital pulse signals. BPSK modulator is basically a phase modulator. Here the transmitted signal is a sinusoid of fixed amplitude. It has one....
-
-
This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted....
-
DC motor driver circuit in the following circuit images can be used for DC motor drivers and can control the direction of rotation in two directions with a DC motor rotation speed can be set. Under the DC motor driver circuit is quite simple and is built....
-
Here is a teleremote circuit which enables switching on` and off` of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls. The circuit described here can....
-
I`ve seen this circuit around before, but it kept cropping up while looking at other electronics videos on YouTube. It`s called a Joule Thief, and it was....
-
The multimeter should be set to the lowest dc volts range for maximum sensitivity. This is normally 200mV DC for most meters. The circuit works well at VHF (around 100MHz) and was quite pleased with the results. L1 was 7 turns on a quarter inch former with....
-
The interaction design for the singing pig was to have a different song start playing when a different wig is placed on the pig. The pig needed to stand by itself without being connected to anything else and the wigs needed to look like nothing out of the....
-
This page steps through each section of my implementation of BAMTRAT. Many of the component values shown were determined experimentally, to suit my own tastes and preferences. As when building an acoustic instrument, there is a lot of room for....
-
Any electronics amateur still in possess of a collection of vinyl recordings and aiming at a high quality reproduction should build this preamp and add it to the Modular Preamplifier chain. This circuit features a very high input overload capability, very....
-
In this article, an RC oscillator is used as a baud rate generator. If you can calibrate the frequency of such a circuit sufficiently accurately (within a few percent) using a frequency meter, it will work very well. However, it may well drift a bit after....
-
-
-
To the left in the diagram, you find the micro memory containing up to 64 different addresses each with 15 bits (numbered 1 to 15) that we call the micro operations or MOPs for short. The MOPs control every aspect of the computer. To the left, you also find....
-
The series of UC 3842, 3843, 3844 and 3845 Oscillators can be used to generate sync pulses which no need to have a lot of external components. As seen in the following circuit, it shows Sync Pulse Generator Circuit Diagram of the UC3842/3/4/5. This sync....
-
Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing the efficiency of a transistor or diode, unless the device under test is unsoldered and removed from the pcb. A further....
-
A simple water level sensor or liquid level detector for measuring or detecting a required level of water, liquid, fluid in a tank, pool, well, aquarium, washing machines etc....
-
The recent tsunami in Japan and the on-going calamity with the Fukushima nuclear power plant has apparently greatly increased sales of radiation meters, n....
-
A very simple low cost water level indicator circuit can be designed using this schematic circuit. This water level indicator is based on a simple CMOS IC CD4066 and indicates the amount of water present in the overhead tank and also gives an alarm when the....
-
Our DTMF decoder can be powered from a 9V battery or from your parallel printer port. It can detect and display all 16 DTMF digits on your computer screen in real-time. The Window`s program can be placed in the minimize mode and still detect tones while you....
-
An AC triggered Multitone, polyphonic doorbell. It gives eight melodious tunes for 2 minutes. On each press it will give a new tone which will continue till the melody is over. The circuit is too simple and battery operated It uses the popular melody....
-
This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detect metal wiring if it conducting ac....
-
-
Hi all, I just notice that this 12v switching power supply schematic is hot, some people discuss it in top forum like dp.12v Switching Power Supply....
-
555-Timer has vast application in electronics. In my recent post I showed you other forms in which a 555-Timer could be applied. Today, we shall use 555-Timer in a Monostable Multivibrator configuration to trigger a Driver (Transistor) in energizing a relay....
-
10W Audio Amplifier with Bass-boost. High Quality, very simple design. No preamplifier required. Circuit diagram: Parts: P1 22K Log.Potentiometer (Dual-gang for...
-
The circuit given here is of a simple H bridge motor driver circuit using easily available components. H Bridge is a very effective method for driving motors and it finds a lot of applications in many electronic projects especially in robotics. The circuit....
-
If I use the internal 1. 1V reference for the ADC, and my Analog input exceeds 1. 1V, lets say 2. 5V, is that harmful to my microcontroller Or will ADC value simply clip (to 0x3FF) at 1. 1V Speaking from experience alone, not from datasheet references, so be....
-
A simple Zenner diode tester circuit, when coupled with a PWM generator it can be used to measure the breakdown voltage of Zener diodes. Or more generically, it can be used to measure the breakdown voltages (e. g. BVceo, BVcbo) of BTJ transistors. As you can....
-
In this section,one of the most useful Integrated Circuits or IC, more commonly known as the 555 Timer chip will be discussed. It should be noted that IC`s....
-
-
This is Electronic Siren circuit diagram. The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors are off. When the push button switch is presse....
-
his Circuit converts a voltage control output from a Process Controller to be converted into a Current Control if the AC-Drive or Valve needs a Current Control Signal. This is a three wire voltage to current loop converter. The 1-5 V DC is attenuated and fed....
-
Mostly everything has been put together for the electrical portion of the project. Serial communication is almost working and will be used in conjunction with a Teensy 2. 0 chip to communicate through serial USB and the mega128. A TTL UART serial driver such....
-
The simple FM radio circuit got lost during the transition from vacuum tubes to transistors. In the late 1950s and early 1960s there were several construction articles on building a simple superregenerative FM radio. After exhaustive research into the early....
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This is the schematic diagram of DC motor speed controller circuit. The circuit applies two oscillators/timers which are connected as a Pulse Width Modulator (PWM). The timer chip which applied in this circuit will be an nmos dual timer/osc....
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Color sensing with camera and sufficiently powered processor running image histogram logic (or other such algorithms) can determine presence of certain colours fairly reliably. However, are there other, significantly more cost-effective mechanisms to....
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This is a simple 2N2222 transistor based radio FM transmitter circuit within the FCC (Federal Communications Commission) limit, that is no license is necessary for using thisstable FM transmitter circuit. What is an FM transmitter FM stands for Frequency....
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This is a simple and low cost wide band VHF field strength meter. The field strength is measured by converting the radio signal to DC and measuring it. The RF signal will be picked up by the coil and rectified by the diode D1. Even a very small DC voltage is....
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This circuit indicates audio output power via three LEDs. Nice addon to your amplifier....
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The transition from diodes to synchronous-rectification (SR) MOSFETs in secondary circuits of flyback converters increases with each new generation of MOSFETs, improving performance at little or no cost penalty. SR MOSFETs can be more efficient than diodes,....
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This instructable is intended to show you how to make several different filter circuits, in particular, low pass and high pass filters, along with a....
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Certain circumstances and areas demand detection and securing of the entrances paths through alarm systems, so that the whenever an individual opens the entrance door the situation is instantly tracked by ringing an alarm. Battery operated window and door....
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When a GATE signal (between 3V and 15V), the capacitor C5 acts as a differenciator and converts the gate signal into a brief positive pulse (width 10 ms). D1 protects the circuit from negative voltages. The brief pulse created on the rising edge of the GATE....
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The simple battery charger circuit design shown here uses the versatile IC 555 as the main component. The circuit can be used for charging all types of rechargeable batteries within the specified limits as given in the article...
An output booster is needed when you want to achieve the needed current/voltage gain. Great output commonly need in accociation with the the output power limitation of mostly IC processing. The following figure shows you circuit diagram of the typical....
When designed with general purpose small-signal transistors, the bandwidth is 50MHz to 250MHz so very careful grounding and power supply decoupling is required. Simulation schematic for 2 transistor buffer. *Copyright Poul Petersen 2009 * *Some standard....
This is based on a circuit from the superb electronics info pages at. If you want to know more about IR remote controls, from circuit details to data protocols, look there for info (under `remote control`)! This design allows multiple transmitters and....
I`ve managed to complete the first phase of my motion-controlled photography rig: setting up a pair of bipolar stepper motor controllers. This is the most important non-mechanical part of the project, as without control of motors there can be no....
Nowadays a lot of intercom units are equipped with video cameras so that you can see as well as hear who is at the door. Unfortunately, the camera lens is....
This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker. This one is a unit of switches connected into 4 arranged of 4 columns for a total of eight terminals. When we....
A teardown of a BK Precision 4011 5MHz function generator a few weeks ago. Like most of basic function generators in old days, BK 4011 does not offer frequency sweep as an option. What it does include is a VCG (Voltage controlled Generator) input, which....
This Arduino-powered vocal effects box pitch shifts and distorts incoming audio signals to produce a wide variety of vocal effects. This project is my first experiment with real-time digital signal processing using Arduino. It samples an incoming microphone....
Function: for people wanting to get tanned but at the same time wishing to avoid an excessive exposure to sunlight. Component: Electrolytic Capacitors, ....
Flame Feedback is a sound sculpture built from a speaker driver, a candle, and electronics. The speaker is driven with a low frequency tone, pushing air and causing the candle to flicker. An optical sensor measures the candle flicker and frequency modulates....
The Allegro ACS75x family of Current Sensors provides economical and precise solutions for current sensing in industrial, automotive, commercial, and Communications systems. The device package allows for easy implementation by the customer. Typical....
DC motor drive controller control two DC motors of any current or voltage rating, depending on the rating of the relays. The circuit also provides two shaft encoders for positional feedback to the computer, the motor control circuit is connected to an IBM PC....
The filament of a incandescent bulb is the sensing part of the circuit. When there is no air flow the resistance of the filament will be low. When there is air flow the resistance drops, because the moving air will remove some of the heat generated in the....
Making a light-dimming control system for a 240V heat lamp dissipating around 250W. I need to adjust the heat output on the lamp by control from a microprocessor. I`m developing on an 8051-based SoC with RF circuitry and some sensors and actuators. Basically....
BA5417 is a stereo amplifier IC with a lot of good features like thermal shut down, standby function, soft clipping, wide operating voltage range etc. The IC can deliver 5W per channel into 4 ohm loud speakers at 12V DC supply voltage. The BA5417 has....
Construct universal power supplies, including: Low-voltage power supplies for operating electronic equipment are in the next section. There you`ll find designs for single- and dual-voltage regulated supplies, including an all-purpose adjustable version and....
This tremolo effect circuit uses the XR2206 and the TCA730 IC which is designed as an electronic balance and volume regulator with frequency correction. T...
Here is the circuit diagram of a battery eliminator circuit that can be used as a replacement for 9V PP3 batteries. The circuit given here can be used to power any device that operates from a 9V battery. The transformer T1 steps down the mains voltage and....
I have a 89 seris RS232 programmer but my computer has no RS232 connector so where i have to connect rs232 cable Is any converter for RS232 to usb....
AD9835 is a DDS (direct digital synthesis) chip from Analog Devices. It contains a phase accumulator, sinewave table, and 10-bit D/A converter. In can be used for phase and frequency modulation by selecting the phase and frequency of the signal either under....
The industrial fuel oil furnace controller circuit is composed of the power supply circuit, testing and ignition control circuit and control implementation circuit, and it is shown as the chart. The power supply circuit is composed of the step-down capacitor....
TDA7560 is a 4 x 50 watt quad bridge car audio amplifier. The inputs are compatible with TDA7560 soil and can tolerate very high input signals ( ± 8Vpk) without sacrificing performance. If Hz are included as standard input capacitors (0. 1mF), reducing the....
The way that this receiver works is very similar to the way that we as humans beings work. We see colors and we act depending on the different things seen. The phototransistors does the same thing, if reacts depending upon the intensity of infrared light....
While I`m getting ready to rip open some 10+ broken DVD-RW drives coming to me from an eBay seller, I though it would be great to have a testbed for the bipolar stepper motors I will harvest from those. I have a bunch of ULN2803AG Eight Darlington Transistor....
Basically I used the parts list that is on the first page of the Make Magazine article. But that list is for the harp which has 6 lasers so most quantites can be just 1. ..
The Neumann/Gefell UM 57 was a large-diaphragm tube condenser microphone manufactured by the Neumann company of Gefell, Germany, currently known as Microtech-Gefell. The mic used the Gefell company`s famous M7 capsule. This was a dual-diaphragm,....
The circuit presented here may provide a solution in a number of cases, since it can be used to convert a single-ended supply voltage into a balanced set of supply voltages. That`s not so remarkable by itself, but the special feature of this circuit is that....
Square wave tone bursts is provided by depressing the pushbutton. It`s duration depends on the duration for which the voltage at Pin 4 exceeds a threshold....
Here is an ultra simple automatic light switch circuit for bedrooms. After construction, connect the input terminals of this circuit in parallel to the int....
The Flash MC Programmer II is a fast parallel port programmer for several 40 pin 8051 microcontrollers....
If there are more than some 5mV, reduce this offset value by experimenting with resistors (220K a good starting point) from testpoint Z (junction of R22/R23) to +v if there is a negative voltage or to -v if there is a positive voltage until the voltage at....
This simple DC motor control or PWM circuit using 555 IC can be used to control the speed of a DC motor. The circuit is very simple and can be built in very short time if all parts are available with you....
From a SONY double tape decks with model number "SONY TC-W230" I have picked a nice LCD VU-meter. I have decided to add it to my computer tower case. the following steps explain how to do this. this is based on IC lablelled CXD1017 (impossible to find a....
LA4550 audio amplifier in BTL configuration. This amplifier can deliver 4W into an 8 ohm load at 12V power supply....
Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
Small and simple unit, Can be used for Home-Security purpose In this fire alarm circuit, a Thermistor works as the heat sensor. When temperature increases....
Operational amplifier based triangular wave form generator is simple circuit that is widely used in function generators. Here is the circuit for Triangular wave generator using 741 op amp. We know that the integrator output waveform will be triangular if the....
Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your headlight switch to provide automatic switching between high and low beam....
Not drive a solenoid directly from your Arduino. It requires more current than you can provide and produces destructive voltages when it is switched off. There is a simple solution. The solenoid I was testing with is a 12 volt solenoid the size of my thumb.....
The LED circuit below is an example of using 25 white LEDs in series connected to the 120VAC line. It can be modified for more or less LEDs by adjusting the resistor value. The exact resistance will depend on the particular LEDs used. But working out the....
Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if a SCSI disk controller is fitted, its activity will not....
This is a compact, easy to build amplifier that uses one IC only but delivers 40 watts of audio power. It is ideal for amplifying audio from your mobile CD player or iPod. The chip being used here is the TDA1514 originally brought to the market by....
In binary phase shift keying (BPSK) modulation scheme, the phase of a carrier is changed in accordance with the digital pulse signals. BPSK modulator is basically a phase modulator. Here the transmitted signal is a sinusoid of fixed amplitude. It has one....
This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted....
DC motor driver circuit in the following circuit images can be used for DC motor drivers and can control the direction of rotation in two directions with a DC motor rotation speed can be set. Under the DC motor driver circuit is quite simple and is built....
Here is a teleremote circuit which enables switching on` and off` of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls. The circuit described here can....
I`ve seen this circuit around before, but it kept cropping up while looking at other electronics videos on YouTube. It`s called a Joule Thief, and it was....
The multimeter should be set to the lowest dc volts range for maximum sensitivity. This is normally 200mV DC for most meters. The circuit works well at VHF (around 100MHz) and was quite pleased with the results. L1 was 7 turns on a quarter inch former with....
The interaction design for the singing pig was to have a different song start playing when a different wig is placed on the pig. The pig needed to stand by itself without being connected to anything else and the wigs needed to look like nothing out of the....
This page steps through each section of my implementation of BAMTRAT. Many of the component values shown were determined experimentally, to suit my own tastes and preferences. As when building an acoustic instrument, there is a lot of room for....
Any electronics amateur still in possess of a collection of vinyl recordings and aiming at a high quality reproduction should build this preamp and add it to the Modular Preamplifier chain. This circuit features a very high input overload capability, very....
In this article, an RC oscillator is used as a baud rate generator. If you can calibrate the frequency of such a circuit sufficiently accurately (within a few percent) using a frequency meter, it will work very well. However, it may well drift a bit after....
To the left in the diagram, you find the micro memory containing up to 64 different addresses each with 15 bits (numbered 1 to 15) that we call the micro operations or MOPs for short. The MOPs control every aspect of the computer. To the left, you also find....
The series of UC 3842, 3843, 3844 and 3845 Oscillators can be used to generate sync pulses which no need to have a lot of external components. As seen in the following circuit, it shows Sync Pulse Generator Circuit Diagram of the UC3842/3/4/5. This sync....
Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing the efficiency of a transistor or diode, unless the device under test is unsoldered and removed from the pcb. A further....
A simple water level sensor or liquid level detector for measuring or detecting a required level of water, liquid, fluid in a tank, pool, well, aquarium, washing machines etc....
The recent tsunami in Japan and the on-going calamity with the Fukushima nuclear power plant has apparently greatly increased sales of radiation meters, n....
A very simple low cost water level indicator circuit can be designed using this schematic circuit. This water level indicator is based on a simple CMOS IC CD4066 and indicates the amount of water present in the overhead tank and also gives an alarm when the....
Our DTMF decoder can be powered from a 9V battery or from your parallel printer port. It can detect and display all 16 DTMF digits on your computer screen in real-time. The Window`s program can be placed in the minimize mode and still detect tones while you....
An AC triggered Multitone, polyphonic doorbell. It gives eight melodious tunes for 2 minutes. On each press it will give a new tone which will continue till the melody is over. The circuit is too simple and battery operated It uses the popular melody....
This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detect metal wiring if it conducting ac....
Hi all, I just notice that this 12v switching power supply schematic is hot, some people discuss it in top forum like dp.12v Switching Power Supply....
555-Timer has vast application in electronics. In my recent post I showed you other forms in which a 555-Timer could be applied. Today, we shall use 555-Timer in a Monostable Multivibrator configuration to trigger a Driver (Transistor) in energizing a relay....
10W Audio Amplifier with Bass-boost. High Quality, very simple design. No preamplifier required. Circuit diagram: Parts: P1 22K Log.Potentiometer (Dual-gang for...
The circuit given here is of a simple H bridge motor driver circuit using easily available components. H Bridge is a very effective method for driving motors and it finds a lot of applications in many electronic projects especially in robotics. The circuit....
If I use the internal 1. 1V reference for the ADC, and my Analog input exceeds 1. 1V, lets say 2. 5V, is that harmful to my microcontroller Or will ADC value simply clip (to 0x3FF) at 1. 1V Speaking from experience alone, not from datasheet references, so be....
A simple Zenner diode tester circuit, when coupled with a PWM generator it can be used to measure the breakdown voltage of Zener diodes. Or more generically, it can be used to measure the breakdown voltages (e. g. BVceo, BVcbo) of BTJ transistors. As you can....
In this section,one of the most useful Integrated Circuits or IC, more commonly known as the 555 Timer chip will be discussed. It should be noted that IC`s....
This is Electronic Siren circuit diagram. The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors are off. When the push button switch is presse....
his Circuit converts a voltage control output from a Process Controller to be converted into a Current Control if the AC-Drive or Valve needs a Current Control Signal. This is a three wire voltage to current loop converter. The 1-5 V DC is attenuated and fed....
Mostly everything has been put together for the electrical portion of the project. Serial communication is almost working and will be used in conjunction with a Teensy 2. 0 chip to communicate through serial USB and the mega128. A TTL UART serial driver such....
The simple FM radio circuit got lost during the transition from vacuum tubes to transistors. In the late 1950s and early 1960s there were several construction articles on building a simple superregenerative FM radio. After exhaustive research into the early....
This is the schematic diagram of DC motor speed controller circuit. The circuit applies two oscillators/timers which are connected as a Pulse Width Modulator (PWM). The timer chip which applied in this circuit will be an nmos dual timer/osc....
Color sensing with camera and sufficiently powered processor running image histogram logic (or other such algorithms) can determine presence of certain colours fairly reliably. However, are there other, significantly more cost-effective mechanisms to....
This is a simple 2N2222 transistor based radio FM transmitter circuit within the FCC (Federal Communications Commission) limit, that is no license is necessary for using thisstable FM transmitter circuit. What is an FM transmitter FM stands for Frequency....
This is a simple and low cost wide band VHF field strength meter. The field strength is measured by converting the radio signal to DC and measuring it. The RF signal will be picked up by the coil and rectified by the diode D1. Even a very small DC voltage is....
This circuit indicates audio output power via three LEDs. Nice addon to your amplifier....
The transition from diodes to synchronous-rectification (SR) MOSFETs in secondary circuits of flyback converters increases with each new generation of MOSFETs, improving performance at little or no cost penalty. SR MOSFETs can be more efficient than diodes,....
This instructable is intended to show you how to make several different filter circuits, in particular, low pass and high pass filters, along with a....
Certain circumstances and areas demand detection and securing of the entrances paths through alarm systems, so that the whenever an individual opens the entrance door the situation is instantly tracked by ringing an alarm. Battery operated window and door....
When a GATE signal (between 3V and 15V), the capacitor C5 acts as a differenciator and converts the gate signal into a brief positive pulse (width 10 ms). D1 protects the circuit from negative voltages. The brief pulse created on the rising edge of the GATE....
The simple battery charger circuit design shown here uses the versatile IC 555 as the main component. The circuit can be used for charging all types of rechargeable batteries within the specified limits as given in the article...
