New Circuits Page 167
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The circuit described here is that of a metal detector. The opera- tion of the circuit is based on superheterodyning principle which is commonly used in superhet receivers. The circuit utilises two RF oscillators....
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Design A Low-Cost 4- To 20-mA Receiver Circuit For Control Loops | analog-to-digital converter (ADC)...
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Here is a simple water level buzzer circuit which can be used to detect or sense the level of water in tank, pool, washing machines etc. When the two probes shown in this water level indicator circuit will detect water the buzzer will start producing sound.....
-
Bored of playing around with capacitors Then its time for you to move on to super-capacitors. These have huge storage capabilities. In this article you will find out how to build a small LED flashlight using supercapacitors. The main disadvantage of....
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-
The article now describes how to build a charger controller board and how to program the AVR microcontroller. You should have a LiIon battery you can practice on - my practice battery is still alive and well despite considerable abuse. The more you know....
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-
The following figure shown the driving of two phase bipolar stepper motor control circuit by using the current controller L6506. The IC L506 generates the needed signals to drive the inputs of the L298 of this bipolar stepper motor circuit driver..
-
The Camera1 module provides a RoboBricks2 bus interface for a General-Vision Cognisight MTVS vision system. This module a builtin camera and electronics for recoginizing features in an image. The recognition hardware is based on neural network technology. At....
-
-
A light dimmer that uses TRIAC & DIAC. Controls the brightness of light bulbs. Based on the standard dimmer circuit. A few additional parts were added to eliminate flickering at low light level. Works better then commercial units...
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Originally Posted by taj Is he perhaps more accommodating than his reputation portrays? ..Todd No....
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Here`s my final mic pre schematic. The input phase switch and phantom power circuit is not shown, but is based on Jensen mic input design AS016. Click here for the discussion thread on this project...
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-
Whether you are considering a backup power system, want to add another electric circuit, or are going to install a new appliance, it is important to understand the home`s electrical wiring basics and applicable codes. First, let`s briefly review how....
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-
ISP programmer with circuit diagram for AVR Atmega32 micro controller.This ISP burner circuit is an adaptation of Pony programmer and uses ponyprog software..
-
-
Using only a single transistor and few passive components, you can build a fairly sensitive peak detector. circuit This peak detector circuit is suitable for...
-
Here is a simple charger circuit for charging SMF(sealed maintenance free ) batteries. The charger circuit being curernt and voltage regulated, can be safely used to charge SMF batteries of 1. 2 AH rating. This circuit was actually designed in response to a....
-
High voltage current sensing/monitoring can be designed using LTC6101 op-amp. The following current sensing circuit is capable of measuring electrical current...
-
This oscillator circuit is designed to generate both a rectangular wave and a triangle waveform, around 1kHz to 10kHz. The first operational amplifier in the chain generates the square wave, while the second operational amplifier generates the triangle wave.....
-
My vintage (62 year old) pole light has always been controlled by a timer ”a source of continual frustration due the requirement of readjustment for the ever-changing seasons. However, after knocking it over (I backed my car into it ), I decided it was time....
-
A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light...
-
-
This is a simple LED flasher project that uses a common 555 timer IC for its operation. It is configured as an astable mode which means that its output is a square wave oscillator. Two LEDs are connected to its output in such a way that when one LED is ON,....
-
Even though this CW transmitter circuit was published in 1955 in Popular Electronics, it is still legal for today`s Amateur radio operator. Portions of the 40-meter and 80-meter bands are still reserved exclusively for CW operation. As of 2011 in the....
-
These are the little lights with the stake on the bottom that you can push into the ground along your driveway or sidewalk and have the solar panel on top. The solar cell charges a AA NiCd battery during the day and at night the battery powers the LED. The....
-
This oscilloscope clock project uses a PIC 16F876 and a DAC to generate X and Y signals to draw a clock on the oscilloscope. The original circuit and software was designed by OZ2CPU, which can be found here:. The clock circuit was slightly modified to use a....
-
The FM transmitter circuit here works in the broadcast band 88 to 108MHz, and can be used to broadcast audio signals for remote listening. The output power....
-
Note that the function diagram for either the 5443 and 5444 are identical, assuming a 16-pin dual In-line package. The difference resided in the internal connections as shown in the functional schematic and how the inputs are decoded. That is, the pin-out....
-
-
This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It`s certainly not the first wireless microphone we`ve ever published but this one is a little different. It`s stereo, providing....
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-
-
The figures above shows the basic idea of any robot, where we have some inputs and output devices connected to the brain and some outputs controlled by the brain. In our case we will have the Arduino like the brain. The central Brain, controls all movements....
-
-
ICs that in the past were far too expensive for the hobbyist tend to be more favourably priced these days. An example of this is the AD8099 from Analog Devices. This opamp is available for only a few pounds. The AD8099 is a very fast opamp (1600 V/ms) and....
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This house FM transmitter for your stereo or any other amplifier provides a good signal strength up to a distance of 500 meters with a power output of abou...
-
This is probably the simplest idea to generate flashing light from an LED using AC. The circuit is relatively the simple way of flashing one or more LEDs from a high voltage DC obtained from Mains. This can be used as a Mains indicator or Mock flasher. The....
-
To make 12Volt 35 Amp Power Supply such as those titles can using LM7812 voltage regulator as the regulator 12 Volt DC and as a power supply can use transistor TIP2955. Series Power Supply 12Volt 35 Amp uses 6 units TIP2955 type power regulator transistors.....
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A 12v DC electromagnetic lock with push to lock and push to unlock using my existing LED indicator/switch. The switch should indicate green when unlocked and red when locked. The LED indicator/switch is SD-7175SGEX1Q from It is momentary contact and is....
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Without the specified delay the circuit could malfunction or even get damaged. A capacitor, which is the crucial part of the circuit gets the specific position in the circuit, we can see thatit`s been placed at the other end of the base resistor and not....
-
The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
-
I want to use a picMicro 5v microcontroller combined with the figure 10 circuit from Link1 (Shown below) and a circuit similar to Link2 for motor control. It has to control 2 AC motors at 4 amps each (but the programming will make sure only one motor can....
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-
The DC Brushless Fan is the best solution for now, but some predictions are that computers will soon be at 70dBA or the same noise level of freeway traffic. In the future we all may be liquid cooling but the heat has to go somewhere. Since the DC Brushless....
-
Power and serial communications are provided by the FTDI USB RS232 converter chip. You don`t have to do anything! Connect the USB cable from your computer to the board and a new serial com port will install under Windows. Also includes socket for I2C EEPROM....
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This simple circuit drives 6 LEDs in `Knight Rider scanner mode`. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version)...
-
Using minimum component count; this simple circuit will indicate peak audio response on an analogue meter, similar to a tape recorders meter. The circuit uses an op amp as a non inverting amplifier, but with one addition - a diode in the feedback loop. The....
-
That be On After Delay Circuit. I uses mosfet in the circuit for delay easy more than the transistor. By have the work of the circuit be when press , S1 ,...
-
Energia is a rapid prototyping platform for the Texas Instruments MCU Launchpad. Energia is based on Wiring and Arduino and uses the Processing IDE....
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-
-
This article is for those who wants to make their own car amplifier. The basics of calculation will be discussed below. If you have understand it you will be able to make car amplifier yourself. Actually the difficulty of designing the car power amplifier....
-
The datapath contains registers, an ALU, and an internal system bus. Registers are very fast memory locations that are internal to the CPU and separate from the main system memory. They can be used as "scratch pads" during calculations. The ALU is a....
-
The MT8870 is a complete DTMF receiver integrating both the bandsplit Filter and digital decoder functions. The Filter section uses switched capacitor techniques for high and low group filters; the decoder uses digital counting techniques to detect and....
-
LED will turn on when PIO goes low - acting like GND - and current will be taken from power supply not from PIO like first method. So do I must take care of maximum current of PIO although it just act like GND not like a power supply -like method 1 -. when I....
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The ATMEL AVR programmer works with the Windows program ""Ponyprog"" which works under 95, 98, XP...
-
-
VDP is the photodiode and it has low resistance in the day, and resistance ? 1k?, then transistor VT2 is turned off, then thyristor VT1 is in the off-state as the gate has no trigger current, and E can not be lit. In the night, VL shows a high resistance as....
-
This project is based on integrated circuit from Holtek Semiconductor HT6221/HT6222. Similar parts used to be produced by NEC Semiconductor uPD6121/uPD6122. These ICs are commonly used in television and VCR infra red remote controls, garage door controllers,....
-
a Pierce "aperiodic" oscillator driving a non-neutralized power amplifier for a multiband Morse code transmitter that requires just one coil and minimum adjustment. And then one day you happen to unplug the oscillator tube only to find that it still works!....
-
This wiring circuit diagram is design for when you want to give supply to particular rooms in the home or office in the building in case of failing the power supply. And you want to supply power continuously to the laptop, computer etc in that specific rooms....
-
This PWM Controller circuit is ideal for controlling small motors with 2A maximum current consumption. For higher currents you need additional cooling for....
-
This universal battery charger is based on LM317 and has an adjustable regulated output voltage and also has an adjustable constant-current charging circuit that makes it suitable to use for charging most NiCad batteries and some other types of batteries.....
-
The IR Widget operates in a way that makes it compatible with modern multitasking operating systems. It is able to determine the carrier frequency and demodulate the carrier in the digital or analog domain. The captured information can be used to view,....
-
Here is a portable, high-power incandescent electric lamp flasher. It is basically a dual flasher (alternating blinker) that can handle two separate 230V AC loads (bulbs L1 and L2). The circuit is fully transistorised and battery-powered. The free-running....
-
This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484. The design is simple and sensitivity and selectivity of the receiver are good. All general....
-
This modification is to be done AT YOUR OWN RISK and there is no guarantee that the modification will work for you. Failure to properly install this design correctly may result in damage to you and/or your laserdisc player. This web site takes no....
-
Did not bother to draw out the receiver section because it is quite ordinary. The TRIAC switch section shown below can be controlled by ordinary 4000 series CMOS logic...
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I have found the schematic diagram on Metal Detector For this class it does not have to be orginal, the project can be taken from the internet. I have a few questions regarding this schematic diagram. There is a small arrow connected from the Emitter of the....
-
Sealed-lead-acid batteries, which find wide use in power-electronics products, such as UPS (uninterruptible-power supplies), inverters, and emergency lamps, supply power to the load whenever utility power is unavailable. When you restore utility power, a....
-
A transformer with 2 input leads and 3 output leads. I hooked up an LED to 2 of the output and put a dead AA battery on the input and the LED blinked for a second. I have no data on the transformer, but I am wondering if it is possible (and if so what is the....
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This circuit is extremely simple, therefore there is less chance of any problems. It can be placed anywhere on the phone line and it will record any conversation on any phone on that line. Please note: I have received several emails saying that this circuit....
-
-
This circuit uses an MC3392 low side protected switch and an MC1455 timing circuit to form an automotive instrumentation panel lamp dimmer control. The brightness of incandescent lamps can be varied by Pulse Width Modulating the input of the MC3392....
-
This is a single channel (on / off) universal switch that may be used with any Infra Red remote control that uses wavelengths between 850-950nm....
-
LED STEREO SOUND LEVEL INDICATOR FOR AUDIO AMPLIFIER // Many circuits can be designed as level indicators by using a comparator IC or transistors but....
-
-
Hello, I need a simple to make LED based (not 7-segment) voltmeter to monitor the voltage of a variable supply. I have found this circuit....
-
Audio Graphic Equaliser. Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. I didn`t...
-
A transverter on a range of 70 MHz. With access to the transceiver KENWOOD TR-751A (144 - 146 MHz), which was already prepared to work with the transverter DB6NT 5. 6 and 10 GHz, ie, output power is reduced to 1 watt, and transfer to the central core of....
-
Dilshan designed a RAM memory extender for PIC microcontrollers. The circuit uses some logic ICs and SRAM memory modules to extend the data memory of a PIC. The designer provided source code for this project written for the MikroC compiler. With this given....
-
-
This circuit displaying the sound generator which will simulate British police car siren. The circuit is built using 2 pieces of timer IC 555 to ....
-
This application note explains how the transfer function of most op amp circuits can be derived by a simple process of nodal analysis....
-
A loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductor with its ends connected to a balanced transmission line. Within this physical description there are two very distinct antenna designs: the small....
-
I hacked together a quick and dirty Arduino MIDI-to-DMX control for our robot band Science Fiction Children. It`s really simple! And here`s how I did it. I have two really cheap LED Par56 from Stairville (DMX controlled), a simple DMX-Dimmer pack and use....
-
-
-
IR Beam Breaker Circuit Diagram. This is an Infrared beam breaking alarm ideal to use in entry or passages. It is based on the working of the popular IR sensor Module TSOP 1738 which senses 38 kHz Infrared pulses from the IR LED of the transmitter. Range of....
-
As can be seen in the first diagram below, the configuration is a simple mosfet based designed for amplifying current at +/-60 volts such that the connected transformer corresponds to generate the required 1kva output. Q1, Q2 forms the initial differential....
-
Here is an example which implements a clock in just 36 lines of perl code. It displays time and date and the upper right corner shows a little icon called "heartbeat". The "heartbeat" is added by the LCDd server. This "heartbeat" icon blinks once in a while....
-
The 7490 counter is a negative edge triggered decade counter that counts from 0 to 9. Pins CLKB & QA must be connected for this counter in order that it would operate in the decade mode. The inputs R0(1, 2) & R9(1, 2) are asynchronous reset pins, one of each....
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DIY Homemade Tesla Coil Tuner. How to make a Tesla Coil Tuner from easily obtainable parts. Find the resonant frequency of Tesla Coil parts....
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There will be many times where it is desirable to use the P05 supply module from a higher voltage source. For example, if you want to add balanced inputs....
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Using white LEDs for illuminating our homes is becoming popularnowadays, due to the high power efficiency involved with these devices. The diagram shows a straightforward configuration involving many LEDs, arranged in series and parallel. Refrring to the....
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Perhaps this is one of the simplest and smallest FM radio receiver that can receive the FM stations available locally. Its simple design makes it ideal for....
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I am attempting to build a distortion circuit using 1 12AU7 tube as a diode. I know that the circuit is primitive but really its only to add in the ex....
The circuit described here is that of a metal detector. The opera- tion of the circuit is based on superheterodyning principle which is commonly used in superhet receivers. The circuit utilises two RF oscillators....
Design A Low-Cost 4- To 20-mA Receiver Circuit For Control Loops | analog-to-digital converter (ADC)...
Here is a simple water level buzzer circuit which can be used to detect or sense the level of water in tank, pool, washing machines etc. When the two probes shown in this water level indicator circuit will detect water the buzzer will start producing sound.....
Bored of playing around with capacitors Then its time for you to move on to super-capacitors. These have huge storage capabilities. In this article you will find out how to build a small LED flashlight using supercapacitors. The main disadvantage of....
The article now describes how to build a charger controller board and how to program the AVR microcontroller. You should have a LiIon battery you can practice on - my practice battery is still alive and well despite considerable abuse. The more you know....
The following figure shown the driving of two phase bipolar stepper motor control circuit by using the current controller L6506. The IC L506 generates the needed signals to drive the inputs of the L298 of this bipolar stepper motor circuit driver..
The Camera1 module provides a RoboBricks2 bus interface for a General-Vision Cognisight MTVS vision system. This module a builtin camera and electronics for recoginizing features in an image. The recognition hardware is based on neural network technology. At....
A light dimmer that uses TRIAC & DIAC. Controls the brightness of light bulbs. Based on the standard dimmer circuit. A few additional parts were added to eliminate flickering at low light level. Works better then commercial units...
Originally Posted by taj Is he perhaps more accommodating than his reputation portrays? ..Todd No....
Here`s my final mic pre schematic. The input phase switch and phantom power circuit is not shown, but is based on Jensen mic input design AS016. Click here for the discussion thread on this project...
Whether you are considering a backup power system, want to add another electric circuit, or are going to install a new appliance, it is important to understand the home`s electrical wiring basics and applicable codes. First, let`s briefly review how....
ISP programmer with circuit diagram for AVR Atmega32 micro controller.This ISP burner circuit is an adaptation of Pony programmer and uses ponyprog software..
Using only a single transistor and few passive components, you can build a fairly sensitive peak detector. circuit This peak detector circuit is suitable for...
Here is a simple charger circuit for charging SMF(sealed maintenance free ) batteries. The charger circuit being curernt and voltage regulated, can be safely used to charge SMF batteries of 1. 2 AH rating. This circuit was actually designed in response to a....
High voltage current sensing/monitoring can be designed using LTC6101 op-amp. The following current sensing circuit is capable of measuring electrical current...
This oscillator circuit is designed to generate both a rectangular wave and a triangle waveform, around 1kHz to 10kHz. The first operational amplifier in the chain generates the square wave, while the second operational amplifier generates the triangle wave.....
My vintage (62 year old) pole light has always been controlled by a timer ”a source of continual frustration due the requirement of readjustment for the ever-changing seasons. However, after knocking it over (I backed my car into it ), I decided it was time....
A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light...
This is a simple LED flasher project that uses a common 555 timer IC for its operation. It is configured as an astable mode which means that its output is a square wave oscillator. Two LEDs are connected to its output in such a way that when one LED is ON,....
Even though this CW transmitter circuit was published in 1955 in Popular Electronics, it is still legal for today`s Amateur radio operator. Portions of the 40-meter and 80-meter bands are still reserved exclusively for CW operation. As of 2011 in the....
These are the little lights with the stake on the bottom that you can push into the ground along your driveway or sidewalk and have the solar panel on top. The solar cell charges a AA NiCd battery during the day and at night the battery powers the LED. The....
This oscilloscope clock project uses a PIC 16F876 and a DAC to generate X and Y signals to draw a clock on the oscilloscope. The original circuit and software was designed by OZ2CPU, which can be found here:. The clock circuit was slightly modified to use a....
The FM transmitter circuit here works in the broadcast band 88 to 108MHz, and can be used to broadcast audio signals for remote listening. The output power....
Note that the function diagram for either the 5443 and 5444 are identical, assuming a 16-pin dual In-line package. The difference resided in the internal connections as shown in the functional schematic and how the inputs are decoded. That is, the pin-out....
This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It`s certainly not the first wireless microphone we`ve ever published but this one is a little different. It`s stereo, providing....
The figures above shows the basic idea of any robot, where we have some inputs and output devices connected to the brain and some outputs controlled by the brain. In our case we will have the Arduino like the brain. The central Brain, controls all movements....
ICs that in the past were far too expensive for the hobbyist tend to be more favourably priced these days. An example of this is the AD8099 from Analog Devices. This opamp is available for only a few pounds. The AD8099 is a very fast opamp (1600 V/ms) and....
This house FM transmitter for your stereo or any other amplifier provides a good signal strength up to a distance of 500 meters with a power output of abou...
This is probably the simplest idea to generate flashing light from an LED using AC. The circuit is relatively the simple way of flashing one or more LEDs from a high voltage DC obtained from Mains. This can be used as a Mains indicator or Mock flasher. The....
To make 12Volt 35 Amp Power Supply such as those titles can using LM7812 voltage regulator as the regulator 12 Volt DC and as a power supply can use transistor TIP2955. Series Power Supply 12Volt 35 Amp uses 6 units TIP2955 type power regulator transistors.....
A 12v DC electromagnetic lock with push to lock and push to unlock using my existing LED indicator/switch. The switch should indicate green when unlocked and red when locked. The LED indicator/switch is SD-7175SGEX1Q from It is momentary contact and is....
Without the specified delay the circuit could malfunction or even get damaged. A capacitor, which is the crucial part of the circuit gets the specific position in the circuit, we can see thatit`s been placed at the other end of the base resistor and not....
The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
I want to use a picMicro 5v microcontroller combined with the figure 10 circuit from Link1 (Shown below) and a circuit similar to Link2 for motor control. It has to control 2 AC motors at 4 amps each (but the programming will make sure only one motor can....
The DC Brushless Fan is the best solution for now, but some predictions are that computers will soon be at 70dBA or the same noise level of freeway traffic. In the future we all may be liquid cooling but the heat has to go somewhere. Since the DC Brushless....
Power and serial communications are provided by the FTDI USB RS232 converter chip. You don`t have to do anything! Connect the USB cable from your computer to the board and a new serial com port will install under Windows. Also includes socket for I2C EEPROM....
This simple circuit drives 6 LEDs in `Knight Rider scanner mode`. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version)...
Using minimum component count; this simple circuit will indicate peak audio response on an analogue meter, similar to a tape recorders meter. The circuit uses an op amp as a non inverting amplifier, but with one addition - a diode in the feedback loop. The....
That be On After Delay Circuit. I uses mosfet in the circuit for delay easy more than the transistor. By have the work of the circuit be when press , S1 ,...
Energia is a rapid prototyping platform for the Texas Instruments MCU Launchpad. Energia is based on Wiring and Arduino and uses the Processing IDE....
This article is for those who wants to make their own car amplifier. The basics of calculation will be discussed below. If you have understand it you will be able to make car amplifier yourself. Actually the difficulty of designing the car power amplifier....
The datapath contains registers, an ALU, and an internal system bus. Registers are very fast memory locations that are internal to the CPU and separate from the main system memory. They can be used as "scratch pads" during calculations. The ALU is a....
The MT8870 is a complete DTMF receiver integrating both the bandsplit Filter and digital decoder functions. The Filter section uses switched capacitor techniques for high and low group filters; the decoder uses digital counting techniques to detect and....
LED will turn on when PIO goes low - acting like GND - and current will be taken from power supply not from PIO like first method. So do I must take care of maximum current of PIO although it just act like GND not like a power supply -like method 1 -. when I....
The ATMEL AVR programmer works with the Windows program ""Ponyprog"" which works under 95, 98, XP...
VDP is the photodiode and it has low resistance in the day, and resistance ? 1k?, then transistor VT2 is turned off, then thyristor VT1 is in the off-state as the gate has no trigger current, and E can not be lit. In the night, VL shows a high resistance as....
This project is based on integrated circuit from Holtek Semiconductor HT6221/HT6222. Similar parts used to be produced by NEC Semiconductor uPD6121/uPD6122. These ICs are commonly used in television and VCR infra red remote controls, garage door controllers,....
a Pierce "aperiodic" oscillator driving a non-neutralized power amplifier for a multiband Morse code transmitter that requires just one coil and minimum adjustment. And then one day you happen to unplug the oscillator tube only to find that it still works!....
This wiring circuit diagram is design for when you want to give supply to particular rooms in the home or office in the building in case of failing the power supply. And you want to supply power continuously to the laptop, computer etc in that specific rooms....
This PWM Controller circuit is ideal for controlling small motors with 2A maximum current consumption. For higher currents you need additional cooling for....
This universal battery charger is based on LM317 and has an adjustable regulated output voltage and also has an adjustable constant-current charging circuit that makes it suitable to use for charging most NiCad batteries and some other types of batteries.....
The IR Widget operates in a way that makes it compatible with modern multitasking operating systems. It is able to determine the carrier frequency and demodulate the carrier in the digital or analog domain. The captured information can be used to view,....
Here is a portable, high-power incandescent electric lamp flasher. It is basically a dual flasher (alternating blinker) that can handle two separate 230V AC loads (bulbs L1 and L2). The circuit is fully transistorised and battery-powered. The free-running....
This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484. The design is simple and sensitivity and selectivity of the receiver are good. All general....
This modification is to be done AT YOUR OWN RISK and there is no guarantee that the modification will work for you. Failure to properly install this design correctly may result in damage to you and/or your laserdisc player. This web site takes no....
Did not bother to draw out the receiver section because it is quite ordinary. The TRIAC switch section shown below can be controlled by ordinary 4000 series CMOS logic...
I have found the schematic diagram on Metal Detector For this class it does not have to be orginal, the project can be taken from the internet. I have a few questions regarding this schematic diagram. There is a small arrow connected from the Emitter of the.....jpg "mosfet prevents battery damage")
Sealed-lead-acid batteries, which find wide use in power-electronics products, such as UPS (uninterruptible-power supplies), inverters, and emergency lamps, supply power to the load whenever utility power is unavailable. When you restore utility power, a....
A transformer with 2 input leads and 3 output leads. I hooked up an LED to 2 of the output and put a dead AA battery on the input and the LED blinked for a second. I have no data on the transformer, but I am wondering if it is possible (and if so what is the....
This circuit is extremely simple, therefore there is less chance of any problems. It can be placed anywhere on the phone line and it will record any conversation on any phone on that line. Please note: I have received several emails saying that this circuit....
This circuit uses an MC3392 low side protected switch and an MC1455 timing circuit to form an automotive instrumentation panel lamp dimmer control. The brightness of incandescent lamps can be varied by Pulse Width Modulating the input of the MC3392....
This is a single channel (on / off) universal switch that may be used with any Infra Red remote control that uses wavelengths between 850-950nm....
LED STEREO SOUND LEVEL INDICATOR FOR AUDIO AMPLIFIER // Many circuits can be designed as level indicators by using a comparator IC or transistors but....
Hello, I need a simple to make LED based (not 7-segment) voltmeter to monitor the voltage of a variable supply. I have found this circuit....
Audio Graphic Equaliser. Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. I didn`t...
A transverter on a range of 70 MHz. With access to the transceiver KENWOOD TR-751A (144 - 146 MHz), which was already prepared to work with the transverter DB6NT 5. 6 and 10 GHz, ie, output power is reduced to 1 watt, and transfer to the central core of....
Dilshan designed a RAM memory extender for PIC microcontrollers. The circuit uses some logic ICs and SRAM memory modules to extend the data memory of a PIC. The designer provided source code for this project written for the MikroC compiler. With this given....
This circuit displaying the sound generator which will simulate British police car siren. The circuit is built using 2 pieces of timer IC 555 to ....
This application note explains how the transfer function of most op amp circuits can be derived by a simple process of nodal analysis....
A loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductor with its ends connected to a balanced transmission line. Within this physical description there are two very distinct antenna designs: the small....
I hacked together a quick and dirty Arduino MIDI-to-DMX control for our robot band Science Fiction Children. It`s really simple! And here`s how I did it. I have two really cheap LED Par56 from Stairville (DMX controlled), a simple DMX-Dimmer pack and use....
IR Beam Breaker Circuit Diagram. This is an Infrared beam breaking alarm ideal to use in entry or passages. It is based on the working of the popular IR sensor Module TSOP 1738 which senses 38 kHz Infrared pulses from the IR LED of the transmitter. Range of....
As can be seen in the first diagram below, the configuration is a simple mosfet based designed for amplifying current at +/-60 volts such that the connected transformer corresponds to generate the required 1kva output. Q1, Q2 forms the initial differential....
Here is an example which implements a clock in just 36 lines of perl code. It displays time and date and the upper right corner shows a little icon called "heartbeat". The "heartbeat" is added by the LCDd server. This "heartbeat" icon blinks once in a while....
The 7490 counter is a negative edge triggered decade counter that counts from 0 to 9. Pins CLKB & QA must be connected for this counter in order that it would operate in the decade mode. The inputs R0(1, 2) & R9(1, 2) are asynchronous reset pins, one of each....
DIY Homemade Tesla Coil Tuner. How to make a Tesla Coil Tuner from easily obtainable parts. Find the resonant frequency of Tesla Coil parts....
There will be many times where it is desirable to use the P05 supply module from a higher voltage source. For example, if you want to add balanced inputs....
Using white LEDs for illuminating our homes is becoming popularnowadays, due to the high power efficiency involved with these devices. The diagram shows a straightforward configuration involving many LEDs, arranged in series and parallel. Refrring to the....
Perhaps this is one of the simplest and smallest FM radio receiver that can receive the FM stations available locally. Its simple design makes it ideal for....
I am attempting to build a distortion circuit using 1 12AU7 tube as a diode. I know that the circuit is primitive but really its only to add in the ex....
