New Circuits Page 132
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This easy to build FM transmitter bug can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Transmitter frequency range is 88-108 MHz. Max current consumption is 30mA. You can power the fm transmitter bug with a....
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This mic preamp uses the low noise IC uA739. The circuit is an example of how a good preamplifier can be designed for dynamic microphones. The IC houses tw...
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Compact fluorescent lamps have some benefits in comparison with classic light bulbs. It is lower power consumption (to 80%) and much longer lifetime (5 to 15 times). Disadvantages are longer starts mainly at more expensive types, impossibility to use darker....
-
In the figure is the 567 FM demodulator circuit. In the figure, the FM signal is input from 3-pin and the demodulated signal is output from 5-pin. The central frequency of the FM signal that the circuit can demodulate is: fo=1.1/RC. In the circuit, C1 is the....
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The circuit was designed for the purpose of creating a voltmeter with high impedance that would measure Direct Current voltages across any types of circui...
-
Herein is the scematic picture of 9-Pin RS232 Line Booster Signal Direction. This device is a 9-pin RS-232 repeater that re-transmits all 8 signals and carries the ground line through..
-
-
The Allegro ® A8732 is a Xenon photoflash charger IC designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. By using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is....
-
Here the circuit diagram of DC battery tester designed by Matthew B. This circuit can be used to measure DC battery from 1. 5V up to 9V. Component Parts List: R1 = 18K Ohm R2 = 240 Ohm R3 = 8. 2K Ohm R4 = 3K Ohm R5 = 10 Ohm M1 = Panel Meter (Anyone will.....
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This project really works with water. I don`t know how can I use this but you know that I like those stuff. I started my tesla coil too but I don`t think that this stuff will work. from a conventional transformer in that the voltage and current relationships....
-
The simple transistor tester in Figure 1 lets you identify the type of transistor, and it helps in detecting a transistor`s emitter, collector, and base....
-
Build a reprogrammable cartridge. Many things can be done with such a cartridge: You can develop your own applications or games and try them on real hardware instead of using an emulator. If you`d like to get into genesis development, I think the genesis....
-
-
The TK10931V is an IF IC contains 2 IF systems ( one is for FM, the other is for AM ) and detector. It is suitable for amateur Radios CB Radios scanner receivers, utility Radios and so on. By Toko Inc. ..
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The audio mixer schematic we propose is developed arround 4 amplifiers build inside SSM2024 produced by Precision Monolithics Inc. (PMI) and is voltage controlled (VR). The maximum VR voltage is 5. 5Volt. The signal/noise ratio is 90dB and 130Khz band wide.....
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Electron tubes How Electron tubes work, Early tube history, The triode, The tetrode, Beam power tubes, The pentode, Combination tubes, Tube parameters, Ionization (gas-filled) tubes, Display tubes, Microwave tubes, Tubes versus Semiconductors Electron tubes....
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Many educational haptic feedback devices use kinesthetic force feedback devices such as the Novint Falcon and the Phantom Omni. Although these devices are relatively cheap compared to other high end haptic feedback devices, they are still expensive for....
-
UTC KA22427 is a one-chip AM/FM radio integrated circuit that is suitable for portable radio applications. It includes AM amplifier, local OSC, AM mixer, AM/FM amplifier, AM AGE, FM AGE circuit an....
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-
Our car radio has the annoying habit of forgetting what part of a CD it was playing when you turn it off. On long drives this is a real drag; I`ll leave an audio book playing for my family in the car while I gas up, and when I turn the key from Accessory to....
-
This transistor based alarm features automatic Exit and Entry delays - together with a timed Bell Cut-off and system Reset. Along with the Exit/Entry zone - the basic alarm board has one Instant Zone. This will be adequate in many situations. However - the....
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The most outrageous option would be to provide power via a battery pack. A more likely source would be the car`s battery. However, since the circuit`s goal is to sound the buzzer when the headlights are on, we might as well take the power from the....
-
An Operational amplifier based sine wave generator circuit, it is basically a wein bridge oscillator. Because of its simplicity and stability, one of the most commonly used audio frequency oscillator is wein-bridge. The wein bridge oscillator in which the....
-
I`m having issues simulating this circuit on Proteus. Please take a quick look and make sure I did`nt make a goofy mistake. I`m also a novice with....
-
How often on average do you have to call members of your family each day to tell them that dinner is ready, it`s time to leave, and the like The person you want is usually in a different room, such as the hobby room or bedroom. A powerful buzzer in the room,....
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The circuit was created to produce an oscillator operating at low frequency for use in the production of electronic music and experimenting and testing to....
-
-
Build your own a personal data logger for recording analog signal. The MiniLOGGER provides 8-channel analog input(-99mV to +999mV), 1-channel pulse input, battery backup 256kB SRAM, Real-time Clock, and RS232C. Start/Stop recording can be made by MANUAL....
-
Many consumer products using white light LEDs for illumination and backlighting provide gradual LED illumination at turnon and turnoff. This gradual illumination is usually achieved with the aid of a Microprocessor that provides PWM dimming control. This....
-
-
This really a work that so cool if you like modif PC. So this is a USB interface for alphanumeric LCD display like 4 G— 20 which can be controlled with LCD Smartie program. USB interface is implemented by using PIC18F2550 microcontroller, Using USB LCD....
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The following file contains detail info about design of Clock Oscillator Basic Circuit Diagram. Included in this file information about: selecting the....
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A very simple Ionization Smoke Detector with Interconnect and Timer alarm circuit can be constructed using the A5367 low-current, CMOS circuit that provides all of the required features for an ionization-type smoke detector. A very nice thing at this....
-
Here I am going to explain you how to make a wireless car. With the advent of IC`s, it has become very simple. Some registers are also required. To make your work simpler I would recommend to go to an Electronics Shop and ask for wireless Car 413 Mhz ASK....
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Choosing the right DC motor is critical when building mobile robots. Testing DC motors is an easy process and can be done by building a simple DC motor circuit. All that is required to build this circuit is a DC motor, a battery power source of at least 3 V,....
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Why do I need C1 What does it do I don`t understand their role in the circuit. Why do I need C4 and C5 I don`t understand their role in the circuit c) why doe I need R6 and R8. As for those caps on the power rail, they clean up the signal to make it less....
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An automatic feeder that would dispense food based on the activation of a series of buttons. The buttons, the system controller, and the food dispenser. The buttons and food dispenser interfaced with the system controller to allow for intelligent processing....
-
The Vc1 increases linearly when the pull-up resistor RA in the mono stable circuit is replaced with constant current source, generating a linear ramp. This is the figure that shown the linear ramp generating circuit and the generated linear ramp waveforms....
-
-
A TMOS MTM7N45 (Q2) is used as a series pass element in a linear high voltage supply that accepts +275-V unregulated and produces 250 V regulated with foldback current limiting. A 15-V zener, D1, provides the dc reference for operational amplifier U1, whose....
-
A power supply in a system utilizing as a source of fuel a generator for separating hydrogen and oxygen gasses from natural water and having the capabilities to control the production of gasses by varying the amplitude of the voltage and/or the pulse....
-
A project of moisture sensor alarm circuit it can be for detecting moisture in plant soil, wood, irrigation areas etc....
-
This is a license to use the files to make up to 12 boards. If you want to make more contact me. Please note that you agree to make 12 or fewer in your message when you order. You may not resell the boards. If you want to do that contact me...
-
The momentary switch used was rated for 10A for safty. If the switch was rated for too small a current, the instantaneous current for the first millisecond would fuse the switch contacts together. To achieve objective 3, some sort of switch that can vary....
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Rain Alarm. This circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used...
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The gate N1 acts as a buffer for strengthening the signals from the condenser microphone. The inverter N2 with its associated components forms a radio frequency oscillator in the FM region. The varicap diode BB109 is used for frequency modulating the audio....
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This is a Sony Triniton, Model KV-20M10, manufactured July 1995. There are no blinking lights (there really are no lights to blink) or clicking sounds. The described symptom on this particular model using a BA-2 chassis would indicate an internal hardware....
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This is a project I`ve done on behalf of a person on an internet forum. The requested operation is simple: Use an EasyDriver stepper motor driver and a 1. 8 deg/rotation stepper motor and make the motor turn one revolution per minute. This frees me up a bit....
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The TV transmitter given here uses UK standard 1 FM modulation for sound and PAL for video modulation. The audio signal to be modulated is pre-amplified using the transistor Q1 and associated components. The transistor Q2 has two jobs: production of carrier....
-
This universal triac controller circuit with optocoupler solves the problem that triacs have when functioning at low temperatures (triac needs higher gate...
-
A simple fire alarm circuit based on a LDR and lamp pair for sensing the fire. The alarm works by sensing the smoke produced during fire. The circuit produces an audible alarm when the fire breaks out with smoke. When there is no smoke the light from the....
-
Telephone line based audio muting and light on circuit. Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone...
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The transmitter is equiped with LM567, tone decoder circuit. Audio signal ( at least 50mVvv ) is amplified with T1 and then it is used to modulate IC1. Infrared transmitter frequency is adjusted with P2 between 25 and 40KHz...
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This is a remote on-off switch circuit. With this circuit, we can take the benefit of using small switch to control larger AC current from high power devices....
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-
-
understanding of the function and sizing of the resistors Rg and Rf for the bubba oscillator circuit described on the application report SLOA060 - march 2011, page 17 figure 18. The oscillator porpuse is to develope a current inverter thru the H-bridge....
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-
In this picture is everything you will need to make a self running power supply. The input is a 12vdc 7ah lead acid or gel cell battery (not shown). The input goes to a 12vdc to 120vac inverter of about 200 watts more or less, it is not critical as long as....
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hi i m wanted to start building a tube compressor for my bass guitar , i found a compressor schematic with two ecc83 , but it seems it s too old ,and....
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-
-
A speaker/microphone/transmit button circuit for the puxing 777 which probably works for all puxing radios. I decided to reverse-engineering an earphone/microphone headset that came with the radio to determine how it worked. I can`t claim that I`m an expert....
-
A 1989 buick electra park avenue with a battery drainage problem. I think i have located the culprit but not the exact source. When the engine is off after running awhile, what i think is a compressor of sorts is engaging. It runs for 5 to 7 second....
-
The circuit was designed to produce an indication before a 12 V lead acid battery would reach the discharged state LM723 a positive NPN standard voltage....
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In some versions you don`t have the input buffer at all, and in some versions the buffer transistors have different biasing or different transistors. Some have even BIG errors. Errorswith the biasing, errors with the transistor symbols. I understand that the....
-
Modern electronics is indispensable for every large model railroad system, and it provides a solution to almost every problem. Although ready-made product....
-
Fridge Door Alarm circuit or a Refrigerator door open alarm using 555 Timer IC, which produces an audible alarm if the door left open for a preset time....
-
I had always assumed that dynamic braking would be most effective at higher speeds. However, actual tests using a Faulhaber (micro mo) gear motor showed that the brake would hold a motor almost stationary. These gearmotors are so well made that I can turn....
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-
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The adjustment control for the contrast of an LC-Display is typically a 10-k potentiometer. This works fine, provided that the power supply voltage is constant. If this is not the case (for example, with a battery power supply) then the potentiometer has to....
-
The schematic for this project is a modified version of the CPLD dev board schematic. There are a few new parts added for this project and you can see the completed schematic for this project below. The main parts in the schematic are the CPLD Dev Board,....
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Hello to everyone! How I can control these graphical LCDs with a microcontroller? Is there any datasheet?....
-
Advanced power door lock management is a necessity now given today`s complex automotive systems. The need to reduce vehicle weight has prompted these more need a schematic for the drivers door lock mechanism for a 93 chevy g-20 The third wire changes,....
-
Use the 48V (60V) DC feedback electric current which is provided by the phone feedback line as the working energy of the electronic doorbell is very economical and practical. Now I introduce one kind of two-tone doorbell circuit with out battery. The circuit....
-
This Balanced pre amp circuit is designed to amplify a little line-level audio signal (from 0 dB to 20 dB), and has balanced inputs and outputs. The scheme uses only conventional components, you`ll have no trouble finding in any electronics. ..
-
-
The circuit is a basic 555 timer circuit in astable mode. In this configuration the IC sends a brief pulse to the buzzer every few minutes. The values....
-
This is a classic 2 transistor astable multivibrator. Many other NPN small signal or switching transistors can be used, including 2N4401, PN2222 or 2N2222 using the circuit on the left. The circuit can also be inverted using PNP transistors such as 2N3906,....
-
This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing purposes. A high-pitched....
-
You cannot beat the Chinese. The project described in this article is a ready-made item from a $2. 00 shop! And it is made in China! It is a wireless doorbell with a cost of about $10. 00. It is so cheap, you could not build it from components for $10. 00!....
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the timer will generate the basic period (for example 20ms) and with some associated variables will be possible to "fire" an I/O pin to generate the signal. For example, using a 8 bit variable, we can divide the generated frequency in "chunks" of 256 (8 bit....
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One of my friends asked me if I could design a circuit for him to be able to remotely power up a server. He has 2 servers and he didn`t want to keep them both on whilst he travelled. He wanted to be able to turn on a server when he needed it. He has one....
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Neon lamps serve as diode gates and indicate positions and moves on game board. Thyratron-relay com bination serves as memory, while relays referee sequence to prevent two successive moves by either player. -C. E. Hendrix and R. B. Purcell, Neon Lamp Logic....
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This FM transmitter circuit is very simple and it has a acceptable transmission . The signal transited from this FM transmitter circuit can be received at....
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This simple automatic emergency light has the following advantages over conventional emergency lights: The charging circuit stops automatically when the b....
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Information for the radio broadcast and listening amateur in VERON department Nieuwegein (A29) and surroundings...
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Schaer is a generic programmer circuit capable of uploading and downloading firmware to/from several electronic devices like microcontrollers a....
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This robot was designed as a project for secondary school pupils to build on an activity day. The chassis was provided to the pupils pre cut. The entire cost of the components per robot was just under GBP5 including the batteries. The robot is built on a....
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To ensure that power electronic components are reliably protected from the effects of non-permissible operating conditions, fast and reliable error detection and effective protective measures are needed....
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Simple 7805 charging circuit to recharge smart phones like the Incredible. Similar in design to the Minty Boost....
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The following circuit shows about Wii “Sensor†Bar Project Circuit Diagram. Features: bunch of infrared LEDs on the both ends of a bar, IR ....
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This is a metal locator circuit. This circuit is useful to detect metal. This circuit uses a AM radio and one-transistor oscillator. This circuit is....
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Here s a design circuit for linear opto coupler circuit that is based on MOC5010 and can be used to isolate a circuit from main grid, audio interface, in medical electronics and many other applications. Here s th ....
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You can buy ready-made programmers, but why spend money when you can build it yourself from parts that you have lying around The simple SI-Prog doesn`t require that many parts and is supported by several popular pieces of software. The full SI-Prog is....
This easy to build FM transmitter bug can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Transmitter frequency range is 88-108 MHz. Max current consumption is 30mA. You can power the fm transmitter bug with a....
This mic preamp uses the low noise IC uA739. The circuit is an example of how a good preamplifier can be designed for dynamic microphones. The IC houses tw...
Compact fluorescent lamps have some benefits in comparison with classic light bulbs. It is lower power consumption (to 80%) and much longer lifetime (5 to 15 times). Disadvantages are longer starts mainly at more expensive types, impossibility to use darker....
In the figure is the 567 FM demodulator circuit. In the figure, the FM signal is input from 3-pin and the demodulated signal is output from 5-pin. The central frequency of the FM signal that the circuit can demodulate is: fo=1.1/RC. In the circuit, C1 is the....
The circuit was designed for the purpose of creating a voltmeter with high impedance that would measure Direct Current voltages across any types of circui...
Herein is the scematic picture of 9-Pin RS232 Line Booster Signal Direction. This device is a 9-pin RS-232 repeater that re-transmits all 8 signals and carries the ground line through..
The Allegro ® A8732 is a Xenon photoflash charger IC designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. By using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is....
Here the circuit diagram of DC battery tester designed by Matthew B. This circuit can be used to measure DC battery from 1. 5V up to 9V. Component Parts List: R1 = 18K Ohm R2 = 240 Ohm R3 = 8. 2K Ohm R4 = 3K Ohm R5 = 10 Ohm M1 = Panel Meter (Anyone will.....
This project really works with water. I don`t know how can I use this but you know that I like those stuff. I started my tesla coil too but I don`t think that this stuff will work. from a conventional transformer in that the voltage and current relationships....
The simple transistor tester in Figure 1 lets you identify the type of transistor, and it helps in detecting a transistor`s emitter, collector, and base....
Build a reprogrammable cartridge. Many things can be done with such a cartridge: You can develop your own applications or games and try them on real hardware instead of using an emulator. If you`d like to get into genesis development, I think the genesis....
The TK10931V is an IF IC contains 2 IF systems ( one is for FM, the other is for AM ) and detector. It is suitable for amateur Radios CB Radios scanner receivers, utility Radios and so on. By Toko Inc. ..
The audio mixer schematic we propose is developed arround 4 amplifiers build inside SSM2024 produced by Precision Monolithics Inc. (PMI) and is voltage controlled (VR). The maximum VR voltage is 5. 5Volt. The signal/noise ratio is 90dB and 130Khz band wide.....
Electron tubes How Electron tubes work, Early tube history, The triode, The tetrode, Beam power tubes, The pentode, Combination tubes, Tube parameters, Ionization (gas-filled) tubes, Display tubes, Microwave tubes, Tubes versus Semiconductors Electron tubes....
Many educational haptic feedback devices use kinesthetic force feedback devices such as the Novint Falcon and the Phantom Omni. Although these devices are relatively cheap compared to other high end haptic feedback devices, they are still expensive for....
UTC KA22427 is a one-chip AM/FM radio integrated circuit that is suitable for portable radio applications. It includes AM amplifier, local OSC, AM mixer, AM/FM amplifier, AM AGE, FM AGE circuit an....
Our car radio has the annoying habit of forgetting what part of a CD it was playing when you turn it off. On long drives this is a real drag; I`ll leave an audio book playing for my family in the car while I gas up, and when I turn the key from Accessory to....
This transistor based alarm features automatic Exit and Entry delays - together with a timed Bell Cut-off and system Reset. Along with the Exit/Entry zone - the basic alarm board has one Instant Zone. This will be adequate in many situations. However - the....
The most outrageous option would be to provide power via a battery pack. A more likely source would be the car`s battery. However, since the circuit`s goal is to sound the buzzer when the headlights are on, we might as well take the power from the....
An Operational amplifier based sine wave generator circuit, it is basically a wein bridge oscillator. Because of its simplicity and stability, one of the most commonly used audio frequency oscillator is wein-bridge. The wein bridge oscillator in which the....
I`m having issues simulating this circuit on Proteus. Please take a quick look and make sure I did`nt make a goofy mistake. I`m also a novice with....
How often on average do you have to call members of your family each day to tell them that dinner is ready, it`s time to leave, and the like The person you want is usually in a different room, such as the hobby room or bedroom. A powerful buzzer in the room,....
The circuit was created to produce an oscillator operating at low frequency for use in the production of electronic music and experimenting and testing to....
Build your own a personal data logger for recording analog signal. The MiniLOGGER provides 8-channel analog input(-99mV to +999mV), 1-channel pulse input, battery backup 256kB SRAM, Real-time Clock, and RS232C. Start/Stop recording can be made by MANUAL....
Many consumer products using white light LEDs for illumination and backlighting provide gradual LED illumination at turnon and turnoff. This gradual illumination is usually achieved with the aid of a Microprocessor that provides PWM dimming control. This....
This really a work that so cool if you like modif PC. So this is a USB interface for alphanumeric LCD display like 4 G— 20 which can be controlled with LCD Smartie program. USB interface is implemented by using PIC18F2550 microcontroller, Using USB LCD....
The following file contains detail info about design of Clock Oscillator Basic Circuit Diagram. Included in this file information about: selecting the....
A very simple Ionization Smoke Detector with Interconnect and Timer alarm circuit can be constructed using the A5367 low-current, CMOS circuit that provides all of the required features for an ionization-type smoke detector. A very nice thing at this....
Here I am going to explain you how to make a wireless car. With the advent of IC`s, it has become very simple. Some registers are also required. To make your work simpler I would recommend to go to an Electronics Shop and ask for wireless Car 413 Mhz ASK....
Choosing the right DC motor is critical when building mobile robots. Testing DC motors is an easy process and can be done by building a simple DC motor circuit. All that is required to build this circuit is a DC motor, a battery power source of at least 3 V,....
Why do I need C1 What does it do I don`t understand their role in the circuit. Why do I need C4 and C5 I don`t understand their role in the circuit c) why doe I need R6 and R8. As for those caps on the power rail, they clean up the signal to make it less....
An automatic feeder that would dispense food based on the activation of a series of buttons. The buttons, the system controller, and the food dispenser. The buttons and food dispenser interfaced with the system controller to allow for intelligent processing....
The Vc1 increases linearly when the pull-up resistor RA in the mono stable circuit is replaced with constant current source, generating a linear ramp. This is the figure that shown the linear ramp generating circuit and the generated linear ramp waveforms....
A TMOS MTM7N45 (Q2) is used as a series pass element in a linear high voltage supply that accepts +275-V unregulated and produces 250 V regulated with foldback current limiting. A 15-V zener, D1, provides the dc reference for operational amplifier U1, whose....
A power supply in a system utilizing as a source of fuel a generator for separating hydrogen and oxygen gasses from natural water and having the capabilities to control the production of gasses by varying the amplitude of the voltage and/or the pulse....
A project of moisture sensor alarm circuit it can be for detecting moisture in plant soil, wood, irrigation areas etc....
This is a license to use the files to make up to 12 boards. If you want to make more contact me. Please note that you agree to make 12 or fewer in your message when you order. You may not resell the boards. If you want to do that contact me...
The momentary switch used was rated for 10A for safty. If the switch was rated for too small a current, the instantaneous current for the first millisecond would fuse the switch contacts together. To achieve objective 3, some sort of switch that can vary....
Rain Alarm. This circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used...
The gate N1 acts as a buffer for strengthening the signals from the condenser microphone. The inverter N2 with its associated components forms a radio frequency oscillator in the FM region. The varicap diode BB109 is used for frequency modulating the audio....
This is a Sony Triniton, Model KV-20M10, manufactured July 1995. There are no blinking lights (there really are no lights to blink) or clicking sounds. The described symptom on this particular model using a BA-2 chassis would indicate an internal hardware....
This is a project I`ve done on behalf of a person on an internet forum. The requested operation is simple: Use an EasyDriver stepper motor driver and a 1. 8 deg/rotation stepper motor and make the motor turn one revolution per minute. This frees me up a bit....
The TV transmitter given here uses UK standard 1 FM modulation for sound and PAL for video modulation. The audio signal to be modulated is pre-amplified using the transistor Q1 and associated components. The transistor Q2 has two jobs: production of carrier....
This universal triac controller circuit with optocoupler solves the problem that triacs have when functioning at low temperatures (triac needs higher gate...
A simple fire alarm circuit based on a LDR and lamp pair for sensing the fire. The alarm works by sensing the smoke produced during fire. The circuit produces an audible alarm when the fire breaks out with smoke. When there is no smoke the light from the....
Telephone line based audio muting and light on circuit. Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone...
The transmitter is equiped with LM567, tone decoder circuit. Audio signal ( at least 50mVvv ) is amplified with T1 and then it is used to modulate IC1. Infrared transmitter frequency is adjusted with P2 between 25 and 40KHz...
This is a remote on-off switch circuit. With this circuit, we can take the benefit of using small switch to control larger AC current from high power devices....
understanding of the function and sizing of the resistors Rg and Rf for the bubba oscillator circuit described on the application report SLOA060 - march 2011, page 17 figure 18. The oscillator porpuse is to develope a current inverter thru the H-bridge....
In this picture is everything you will need to make a self running power supply. The input is a 12vdc 7ah lead acid or gel cell battery (not shown). The input goes to a 12vdc to 120vac inverter of about 200 watts more or less, it is not critical as long as....
hi i m wanted to start building a tube compressor for my bass guitar , i found a compressor schematic with two ecc83 , but it seems it s too old ,and....
A speaker/microphone/transmit button circuit for the puxing 777 which probably works for all puxing radios. I decided to reverse-engineering an earphone/microphone headset that came with the radio to determine how it worked. I can`t claim that I`m an expert....
A 1989 buick electra park avenue with a battery drainage problem. I think i have located the culprit but not the exact source. When the engine is off after running awhile, what i think is a compressor of sorts is engaging. It runs for 5 to 7 second....
The circuit was designed to produce an indication before a 12 V lead acid battery would reach the discharged state LM723 a positive NPN standard voltage....
In some versions you don`t have the input buffer at all, and in some versions the buffer transistors have different biasing or different transistors. Some have even BIG errors. Errorswith the biasing, errors with the transistor symbols. I understand that the....
Modern electronics is indispensable for every large model railroad system, and it provides a solution to almost every problem. Although ready-made product....
Fridge Door Alarm circuit or a Refrigerator door open alarm using 555 Timer IC, which produces an audible alarm if the door left open for a preset time....
I had always assumed that dynamic braking would be most effective at higher speeds. However, actual tests using a Faulhaber (micro mo) gear motor showed that the brake would hold a motor almost stationary. These gearmotors are so well made that I can turn....
The adjustment control for the contrast of an LC-Display is typically a 10-k potentiometer. This works fine, provided that the power supply voltage is constant. If this is not the case (for example, with a battery power supply) then the potentiometer has to....
The schematic for this project is a modified version of the CPLD dev board schematic. There are a few new parts added for this project and you can see the completed schematic for this project below. The main parts in the schematic are the CPLD Dev Board,....
Hello to everyone! How I can control these graphical LCDs with a microcontroller? Is there any datasheet?....
Advanced power door lock management is a necessity now given today`s complex automotive systems. The need to reduce vehicle weight has prompted these more need a schematic for the drivers door lock mechanism for a 93 chevy g-20 The third wire changes,....
Use the 48V (60V) DC feedback electric current which is provided by the phone feedback line as the working energy of the electronic doorbell is very economical and practical. Now I introduce one kind of two-tone doorbell circuit with out battery. The circuit....
This Balanced pre amp circuit is designed to amplify a little line-level audio signal (from 0 dB to 20 dB), and has balanced inputs and outputs. The scheme uses only conventional components, you`ll have no trouble finding in any electronics. ..
The circuit is a basic 555 timer circuit in astable mode. In this configuration the IC sends a brief pulse to the buzzer every few minutes. The values....
This is a classic 2 transistor astable multivibrator. Many other NPN small signal or switching transistors can be used, including 2N4401, PN2222 or 2N2222 using the circuit on the left. The circuit can also be inverted using PNP transistors such as 2N3906,....
This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing purposes. A high-pitched....
You cannot beat the Chinese. The project described in this article is a ready-made item from a $2. 00 shop! And it is made in China! It is a wireless doorbell with a cost of about $10. 00. It is so cheap, you could not build it from components for $10. 00!....
the timer will generate the basic period (for example 20ms) and with some associated variables will be possible to "fire" an I/O pin to generate the signal. For example, using a 8 bit variable, we can divide the generated frequency in "chunks" of 256 (8 bit....
One of my friends asked me if I could design a circuit for him to be able to remotely power up a server. He has 2 servers and he didn`t want to keep them both on whilst he travelled. He wanted to be able to turn on a server when he needed it. He has one....
Neon lamps serve as diode gates and indicate positions and moves on game board. Thyratron-relay com bination serves as memory, while relays referee sequence to prevent two successive moves by either player. -C. E. Hendrix and R. B. Purcell, Neon Lamp Logic....
This FM transmitter circuit is very simple and it has a acceptable transmission . The signal transited from this FM transmitter circuit can be received at....
This simple automatic emergency light has the following advantages over conventional emergency lights: The charging circuit stops automatically when the b....
Information for the radio broadcast and listening amateur in VERON department Nieuwegein (A29) and surroundings...
Schaer is a generic programmer circuit capable of uploading and downloading firmware to/from several electronic devices like microcontrollers a....
This robot was designed as a project for secondary school pupils to build on an activity day. The chassis was provided to the pupils pre cut. The entire cost of the components per robot was just under GBP5 including the batteries. The robot is built on a....
To ensure that power electronic components are reliably protected from the effects of non-permissible operating conditions, fast and reliable error detection and effective protective measures are needed....
Simple 7805 charging circuit to recharge smart phones like the Incredible. Similar in design to the Minty Boost....
The following circuit shows about Wii “Sensor†Bar Project Circuit Diagram. Features: bunch of infrared LEDs on the both ends of a bar, IR ....
This is a metal locator circuit. This circuit is useful to detect metal. This circuit uses a AM radio and one-transistor oscillator. This circuit is....
Here s a design circuit for linear opto coupler circuit that is based on MOC5010 and can be used to isolate a circuit from main grid, audio interface, in medical electronics and many other applications. Here s th ....
You can buy ready-made programmers, but why spend money when you can build it yourself from parts that you have lying around The simple SI-Prog doesn`t require that many parts and is supported by several popular pieces of software. The full SI-Prog is....
