New Circuits Page 89
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A 200-watt class-E AM transmitter used for non-sanctioned broadcasting on 1710 kHz. Negative peak limiter, over-modulation indicator, linear scale directional wattmeter, power supply and antenna circuits (schematic diagram) are also shown....
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The SL517 is designed as the audio, RF or infrared decoder circuit that can be used in the electronic toy application. The internal circuit is composed of the analog amplifier, the frequency divider, the bistable circuit and the driver. Features It uses the....
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The following two photos show the I/V charactereristics of the main Anode/Cathode current for the Tune-a-lite 4 element neon tube used as signal strength meter in some Fada Radios as the Tune-o-graph. The 4 terminal Tuneon tube used in some Cossor radios....
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In some cases, it is desirable to extend the range of the available control and this circuit fits the bill, receiving the IR signal from your remote control and re-transmitting it, for example, around a corner into another room. Photodiode D4 is connected to....
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This was one of those reviews where time and circumstances conspired to allow a dual-test. I made the first contacts with Vacuum State, and Allen was eager to oblige. Combine this with a planned trip to Brittany and it was obvious that Geoff too would have a....
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The circuit diagram of the circuit variable regulator, which uses IC L200, as regulator of voltage and current, IC For this comes from the company ....
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There are many people who want to listen whats going on in VHF 108 - 132 MHz. This vhf am converter converts a band between 106 and 150 MHz, so you can lis....
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Another application of FVC (frequency-to-voltage converter) is tone/frequency decoder. This circuit is used to determine the frequency band of an oscillation...
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Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength of the transmitted signal in relation to the information being sent. For example,....
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Circuit The following schematic shows the design of a Parallel Port Interface Circuit Diagram using 74HCT373. The 74HC/HCT373 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). This parallel port interface circuit....
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This is same circuit as above with the addition of a photo resistor to trigger the flip flop instead of a push button. The bias resistor in series with photo resistor was chosen so that sufficient voltage is present at the base of the 2N3904 to supply....
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Sensitive FM Transmitter. Additional Notes The default for the capacitors type is ceramic, preferably the npo 1% type or equivalent. But basically nothing critical here. Use any...
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Electronic circuits are presented in schematic form. A schematic is really a map showing the path the current takes through the various componenets. Each component is represented by a symbol, usually with either a label or a value (or both). The arangement....
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It`s similar to the Atari Punk synth, aka Forrest Mims` stepped tone generator, but uses two triangle wave oscillators that can be combined or used separately. A wave shaper and square wave LFO are used to increase the aural ridiculousness...
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This is a short-range light barrier for use as an intruder alarm in doorposts, etc. The 555 in the transmitter (Figure 1) oscillates at about 4.5 kHz, sup....
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The IC is a quad 2 input "AND" gate, a CMOS 4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key wired to `E` is pressed, current through R1 and D1 switches Q5 on. The relay energizes; and Q5 is `latched on` by R8. Thus,....
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Building a stroboscope (zoetrope) from Arduino and the spindle motor of a broken Xbox 360 DVD drive. Zoetrope animations, Arduino sketch and circuit diagram included..
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How many different conditions do you reckon may be signalled with just one LED Two, maybe three Using this simple circuit, a lot more! Admittedly, a two-colour LED is used here. Such a device consists of two light-emitting chips, usually red and green,....
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How to do the landscaping project supervision programs were recommended by satellite relay protection and automatic safety device static General table three remote program information Petrochemical Engineering Construction Electrical Transmission inverted....
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If the TV receiver in question does not have a video input and its owner is reluctant to vandalise it in order to fit one then this sort of modulator is the obvious solution. It is a simple circuit that processesvideo signals to enable them to be fed....
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This is a Simple com port based Microchip PIC microcontroller Programmer, This Programmer is based on JDM programmer. The entire programmer is built around commonly available components you can programe may microcontroller by using this schematic, all you....
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This amplifier circuit is used to amplify TV signals in UHF range. It uses a low-noise transistor and gives 10 to 15 dB amplification in the frequency range from 400 MHz to 850 MHz. The transistor must be shielded from the input components and in....
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This is a Universal version of the Four-Digit Alarm Control Keypad. I have modified the design to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I`ve used a SPCO/SPDT relay - but you can use a multi-pole relay if....
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Hello: First of all I must start with the classic ""I`m new to this forum so excuse if this post is in the wrong section / this was already....
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We can create Crystal Colpitts oscillator using a parallel mode crystal and a transistor. The circuit shown by the following figure As an inductance, this....
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My `89 2.6 outside thermometer (Celsius) has blacked out and I was lucky by finding a good e-bayer who has one.. I bought it but appartently it was....
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You see that the feedback is DC coupled, not through a capacitor, from the plate of the second triode to the cathode of the first. An earlier design used AC coupled feedback. This version was unstable at low frequencies. Bode analysis showed that a 3....
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This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses a loundspeaker (20-45 Ohm) on each side...
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The remote control electric hoist control circuit consists of the wireless transmitter, wireless receiver control circuit and the main control circuit. Wireless transmitter uses TWH9326 four key BP transmitter. Wireless receiver control circuit consists of....
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This electronic game pits a human player against the ‘machine’. The opponents use a common ‘game token’ and take turns moving along a path by one, two or three steps, and the winner is the first one to reach the goal exactly. Incredibly enough, this simple....
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This high power class D audio amplifier electronic project is designed using the TDA8920BTH audio power amplifier IC. This power amplifier audio IC has a very high efficiency with very low dissipation, providing a very high output power. The typical output....
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. This mixer shows you how to accomplish microphone pre-amps for low and hi impedance mics. Use the everyman babble op-amp you....
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Here is a very simple and useful project of a 12V power supply circuit using LM7812 IC. LM7812 is a three terminal fixed voltage regulator IC comes in TO220 package. It has many built in features like thermal shutdown, short circuit protection, safe....
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Laser torch is cheap and has high cost performance. The main feature is the excellent performance of the condenser, and the optical rangeis up to 1200m ~ 1500m, and the spot is still small from a few hundred meters in visual observation, so it is widely used....
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In this part of the inquiry in a series of 5-band Equalizer circuits with a single IC BA3812 L. a device used in the hi-fi. IC BA 3812 This is with 5-point Equalizer with all the functions integrated in IC. Equalizer has advantages, namely: small distortion,....
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The DIY Electronic Siren circuit described here can create three different US-style siren sounds: DIY police, DIY ambulance and fire engine. The desired sound can be selected using switch S1. The circuit can be used in toys (such as model vehicles), as part....
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The circuit shows how to interface the ds1820 to microcontroller. As you can see the first pin is connected to GND, the third pin is connected to VCC & the second pin is connected to the Microcontroller. So when the temperature is sensing, it give the sensor....
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Fully illustrated and schematised plans for a high performance, easy to build transistorised high voltage flyback driver....
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A wood table with many holes with different diameters that house the optical fibers. The size of the ceiling lamp (90 cmx 60 cm) did not allow me to use a single bundle of fibers and this is the reason of the two beams I used, each of which comes with a LEDs....
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The internal mute circuit and pre-set gain resistors provide for a very economical design solution. Output power specifications at both 20V and 24V supplies and low external component count offer high value to consumer electronic manufacturers for stereo TV....
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Setup the lights on the breadboard like a traffic light. Red on top, then yellow, and then green. The small red and green are the pedestrian crossing signals. Again red on top and green just below. Put the buttons in so you have at least 2 pin holes space to....
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I`m going to show you how to use your Arduino to control up to 12 servos at once with minimal jitter. Using a simple serial interface you can control the position of up to 12 servo channels. Up to 10 snapshot positions can be saved and played back at any....
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Didn`t measure my resisitors exactly and since they are +/-5% and Vref has a range of 1. 2 to 1. 3 volts you can easily end up over 6 volts. Here is a worst case example: The reason that I disagree with that statement is that they clearly work well in....
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This page is oriented towards the USA marketed radios, simply because it was compiled by USA residents; we described the radios we are familiar with. If anyone would care to share information on the non-USA radios we`d be happy to add them on this page, or....
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A bicycle light control circuit which reads in various buttons and sets various outputs accordingly such as headlight, taillight, blinkers, etc. My current design is based around an ATtiny24 ( Datasheet ) using the internal oscillator (8MHz), programmed in C....
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The following a circuit of 4 watt audio amplifier. The amplifier is using on integrated audio amplifier chip, TDA1013B which is able to gained the audio power output up to 4W at 8 ohm loads. The wide supply voltage range makes this amplifier circuit ideal....
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I needed a sine wave carrier for a magnetic transponder system I am working on. Various types of crystal based oscillator are available such as the Pierce, but these can be tricky to design and ensure they work correctly. Rich suggested using a square wave....
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A very simple controller circuit, with fairly smart performance! Can`t afford a fully automatic computer controlled rotator, but would like more capability from your basic rotator Would you like a simple to use "point and shoot" computer controlled antenna....
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This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec. , e. g. when accessing some dark place, without the necessity of coming back to switch-off the lights. Pushing on P1 allows C1 charging to full 12V....
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The entire remote control is handled by a PIC that controls the GSM/GPRS module`s activity, reads the room temperature through a Dallas DS1820 smart probe, controls the logical state of two opto-isolated inputs, and gives commands to the two relays. In....
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Here I will post some cool looking, challenging yet extremely fun electronic circuits you can build. I studied Electronics most of my life, since I was in middle school electronics have been my passion and have been creating some circuits since then. Most of....
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The notch filter can be added to just about any receiver to attenuate a single frequency by more Lhan 30 dB. This filter should be handy for reducing heterodynes and whistles. ..
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A number of operational amplifier circuits are provided here that are set up to be squarewave oscillators. A squarewave is a Periodic Wave pulse train with a 50 percent duty cycle. The operational amplifier is really just a high-gain amplifier, so....
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Simple Timer With 555 is one example of a simple timer and can be applied to electronic equipment. With 555 Timer Simple series takes advantage of the mode of the IC monostable multivibrator 555. With the relay output control circuit can be used to control....
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To hook up the three Pot connections you will firstly need to establish the tags and the positions that I refer to. If you take the pot and look at the back of it, then make sure that the tags are at the top of the pot, then; The only thing that will happen....
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Okay, I ve decided that I want Daytime Driving lights for my Elise. Also I don t want to keep pressing the button on and off each time I....
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The humidifier circuit is based on a special humidity sensor Type NH-3 from Figaro. Depending on the sensor output, the circuit drives a ventilator that is part of an air humidifying installation. The ventilator is switched on an off by a triac. So as to....
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The 555 timer is an extremely versatile integrated circuit which can be used to build lots of different circuits. You can use the 555 effectively without understanding the function of each pin in detail....
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5v regulated power supply circuit, 5v power supply circuit, regulated power supply circuit diagram....
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The LM1036 is a DC controlled accent (bass/treble), aggregate and antithesis ambit for stereo applications in car radio, TV and audio systems. An added ascendancy ascribe allows loudness advantage to be artlessly effected. Four ascendancy inputs accommodate....
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oscillator is a mechanical or electronic device that works on this principles of oscillation. Oscillators are a basic building blockupon which the whole structure of electronics and computers is based. Here you can find an article about how to make an....
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Sometimes you have to do it the hard way, even if doing it the easy way is an option. That is the case here. The intention is to add a second doorbell in....
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A very simple DIY crystal oscillator circuit which use a quartz for frequency stability and a good rf transistor. Use a 2-nd or 3-rd harmonic crystal, for....
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Fires the slave flash exactly when the main flash occurs. Some flash settings on digital SLR`s are not compatible. Long battery life, 300 hours of use or more. If not turned OFF after use, the unit will shut down after 15 minutes of inactivity. Battery life,....
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This circuit bellow shows a simple voltage-controlled oscillator (VCO), coupled to your instrumentation by an optoisolator, the function for ....
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Typical circuit for welding equipment shown on the following circuit diagram. Turn on delay can be controlled accurately with Potentiometer P2. We can discharge...
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2N3904 is the NPN transistor. Looking at the flat face, the left lead is Emitter (pin 1 in schematic), the middle lead is Base (pin 2 in schematic), the right lead is Collector (pin 3 in schematic). Another end of 50 Ohm resistor to +5v pin on Arduino. (An....
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An Icom PCR-1000 listening to various MF, HF and VHF radio stations. However, there is a slight problem. Very slight, almost too small to even mention, more of an inconvenience than a problem. Still, if I am being inconvenienced, than others are too. This....
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A roulette wheel electronic circuit can be designed using a 4046 PLL containing a voltage controlled oscillator or VCO, two phase comparators, a source follower, and a Zener diode that is used to produce a low-frequency, pulsed output of about 40 Hz. The....
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This MP3 Player FM transmitter can be used to listen to your own music throughout your home. The transmitter circuit use no coils that have to be wound. When this FM transmitter used in the car, there is no need for a separate input to the car stereo to play....
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This circuit is conventional Pierce type oscillator that uses a JFET. The circuit uses fundamental mode crystals. It has decent performance and reliability if...
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I am continuing to add DIY equipment to my home workshop. Audio oscillator is a very useful tool that is needed when we test audio projects. I already have a similar tool but it is just an oscillator without a frequency counter. I decided to use the....
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This article describes three options for interfacing the DS1859 to the MAX3735. Itincludes a new technique using an opamp that gives a linear transfer function that can be adjusted for any arbitrary current range. All of these techniques can be appl....
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The circuit is a remotely operated DTMF telephone. The circuit can be used to change up to 9 devices using the keys 0 to 9 phone. Digit 0 is used to switch between the phone system remotely and change the way of normal conversation. IC KT3170 (DTMF to BCD....
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The same equations can also be applied to D2, R5 and R6 which forms the negative non-linearity of the circuit, although all the signs should be inverted for the threshold voltage equation. Between the positive and negative threshold voltages, only the....
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The interval between rings can be lengthened or shortened by varying the value of the 1 Meg resistor. The 70 volt/ 30 Hz ring voltage is produced from the 120 volt side of a small 12. 6 VAC power transformer (Radio Shack 273-1365). Both capacitors connected....
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The boot-cloner is a program compiled and burnt with the Arduino IDE, that copies part of it`s flash memory onto another microcontroller. The bootloader can be written to a new microcontroller by the Arduino, instead of burning the bootloader onto new....
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This simple circuit uses a 741 op-amp in differential mode as a continuity tester. The voltage difference between the non-inverting and inverting inputs is amplified by the full open loop gain of the op-amp. Ignore the 470k and the 10k control for the....
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Discussion about application of microcontroler PIC16F84 both for Control or Robotics and How to make Programmer of Microcontroller PIC16F84/A. The solar engine is commonly used as an onboard power plant for BEAM-type robots. Sometime called living robots.....