Top Circuits Page 272
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Replacing the front-end with a circuit that down-converts VHF signals in the 2m, 4m or 6m bands to HF signals that can be received in the RX`s "back-end" (which is essentially the Ensemble II RX). The parts provided in this kit permit the builder to select....
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This stage begins at the VHF antenna. The incoming VHF RF signal is preamplified and filtered and presented as the "RF" signal to the ADE + Double Balanced Mixer (DBM). That mixer also accepts the Local Oscillator `s output (BEFORE the Quadrature Clock....
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This kit is the earlier, now retired Ensemble RX version. These instructions are provided for those who possess and might have delayed building that version of the Ensemble RX kit. The latest version is the Ensemble RX II. Kit. The Ensemble RX kit and its 4.....
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Later, I will use the same pivot table to list the parts out by each of the 8 phases in the build, organizing them into phase-specific bags O` parts. First thing I notice is that there are some slight disconnects between the liberally illustrated, online....
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This kit is a daughter board, designed by Jan G0BBL and Tony KB9YIG, that provides four electronically switched band-pass filters for the Softrock Lite + Xtall V9. 0 RX, replacing the single-band daughter board in the original design. The electronically....
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The Motherboard, or Mobo v4. 3. 4 BETA, is an addon board to plug onto the Softrock v6. 3 RxTx, to transform it into an all band (160-10m) HF transceiver electronically controlled via USB. Mobo v4. 3. 4 BETA is developed by a team of radio amateurs. The....
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This kit, designed by Jan G0BBL and implemented and distributed by Tony KB9YIG, is a plug-in board for the Softrock Lite + Xtall RX V9. 0 which down-converts VHF signals in the 2m and 6m bands to HF signals that can be received on the V9. 0 RX. Also....
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The Local Oscillator stage implements a basic Colpitts Crystal Oscillator with a buffer stage to increase the signal level. The oscillator produces a signal that is at the crystal`s specified fundamental frequency. In reality, for each frequency the crystal....
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This kit is based upon an original design by Jan G0BBL and provides a multi-faceted replacement for the older "Rocky" serial interface kit. The kit includes: The control of the programmable Oscillator on the V6. 3 RXTX (and the older, now retired Lite +....
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This is a rather old project I`ve done around 2005 but was not published on my website until now. The idea of building a torch using a glue stick came to my mind when I realized that an AA battery fits perfectly into the glue stick`s plastic case. To make a....
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This LASER is constructed on a polystirene sheet. An alluminium layer foil is placed and acts as a ground plate ( - ), this is important for preionization (i will discuss it later). After that the dielectic is placed on it leaving 1 cm from each border of....
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Knowing the three operational modes the 555 timer offers, it`s not hard to imagine its many applications in IC circuit designs: Oscillator: The 555 timer can be used as a simple clock pulse generator (up to 1 or 2 MHz) A monostable timer is a one-stable....
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Using a battery power source the TENS device produces a high voltage but low current signal at a specified frequency and duration. This electrical current is applied externally to the skin of the body using sticky foam electrode pads. The more expensive....
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The reson this was made this was, was to make first installation fast an a local freiend 10km away, so i cuold start real life testing, so bugs and problems can be solved before this is gived free to all other users. Software is not complete yet, all is....
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Don`t forget to seal your wire splices with heat shrink. It adds tensile strength to wires, is flameretardant and protects them from fraying. Heat shrink tubing forms a protective, insulated, water-resistant covering over wiring splices, crimp terminals and....
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LM5576MHX absolute maximum ratings: (1)VIN to GND: 76V; (2)BST to GND: 90V; (3)PRE to GND: 76V; (4)SW to GND (Steady State): -1. 5V; (5)BST to VCC: 76V; (6)SD, VCC to GND: 14V; (7)BST to SW: 14V; (8)OUT to GND: Limited to Vin; (9)SYNC, SS, FB, RAMP to GND:....
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NE5532DR absolute maximum ratings: (1)Supply voltage: VCC+ 22 V; VCC-: -22 V; (2)Input voltage, either input VCC ±; (3)Input current: ±10 mA; (4)Duration of output short circuit: Unlimited; (5)Package thermal impedance, JA: D package 97ƒ/W; P package 85ƒ/W;....
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I needed to test some crystals for a project I was working on. I found lots of testers on the internet, but they all where lacking in one thing or another. I decided to take one of them and add the features that I wanted to it. This is the result. I also....
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There are two independent modeling light circuits for the P2000D - one for each of the two channels. The modeling light circuit is completely independent from the high voltage strobe circuitry - to the point of having its own On/Off switch. This means, of....
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This page provided to the domain owner free by Sedo`s Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does....
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This is a reproduction of the filter circuit and mic windshield design referred to in the article "Wildlife Recording In Stereo" by David J Tombs which appeared in 1974...
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The second method is to record (realtime) the actual bark in an analog CCD delay line (~100 msec FIFO) and upon recognition that the sound is a bark, the device plays back-through a loudspeaker-that last recorded 100 msec of bark. It really confuses them;....
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A FET impedance converter for use with the Fishman pickup on my Kay orchestra bass. As shown in the schematic below, the circuit is divided into two sections, so that the input section can be mounted inside the head shell of a 1/4" plug. This puts the active....
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The major functional blocks necessary to design a general purpose audio oscillator, and give all the details of my current prototype. Implementation is in the mode of an analog computer, since the desired outputs are sine and cosine values as a function of....
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How to use a desktop computer to solve the complex arithmetic needed to design state-variable filters for audio use. Construction of a tunable notch filter for measuring harmonic distortion is featured. Audio Amateur Corp. did a beautiful job (as always)of....
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A tone generator that runs on as little as 1. 5 Vdc, using the Sallen-Key configuration. And finally, I`ll apply the tone generator to implement a phantom powered signal source for testing balanced microphone inputs. Textbooks and web pages usually show the....
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Requires that DC power be brought into the instrument, either through special cabling or an internal battery. Should not be done to collectible instruments if they didn`t come with onboard electronics. Conveniently implemented as a field effect transistor....
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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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I`ve managed to complete the first phase of my motion-controlled photography rig: setting up a pair of bipolar stepper motor controllers. This is the most important non-mechanical part of the project, as without control of motors there can be no....
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You will need an oscilloscope capable of displaying in X/Y mode, and a reference "LO" signal source. In-phase and Quadrature reference square wave signals are generated by a divide by 4, 2 bit ring counter using 2 D type flip - flops. So that I could use an....
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The Hex switches are connected to J2 as follows: pin 1=common of both switches (+5V) 2=LSB up to 5=MSB of first switch. Then 6=LSB of second switch up to 9 which is MSB. I modified the oscillator slightly to get my cheap Farnell crystal to start reliably....
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When a key is pressed the remote control sends a preamble followed by 32 bits of information encoded using these pulse timings. Examples of these pulses can be seen below as logic analyser screen dumps (the glitches are bugs in the Logic analyser software).....
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A Cmos 4060 Burglar Alarm Circuit This is a single zone alarm - with automatic exit, entry and siren cut-off timers. It will accommodate all the usual types of normally-closed input devices - such as magnetic-reed contacts - foi....
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A Cmos Based Motorcycle Alarm Circuit This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automaticall....
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A Dozen Small Cmos Alarm Circuits Circuit Description This is a selection of small self-contained alarm circuits. The main features of each alarm are described on the circuit diagram itself. They all have a very low standby current. So they This is a....
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A Simple Transistor Based Motorcycle Alarm Circuit This is a simple - easy to build - transistor based motorcycle alarm. It`s designed to work at 12-volts. But - if you change the relay for one with a 6-volt coil - it`ll protect....
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This is the sound generator which will simulate British police car siren. The circuit is built using 2 pieces of timer IC 555 to generate sound frequency. How the circuit work: The 555 on the right is wired as an alarm sound generator and t....
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This is a car alarm simulator which using the LED as a simulation output. This simple circuit can tell you whether your car is running or not by detecting the voltage difference when the car is on and off. This occurs because when your car This is a car....
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This is door knob touch alarm for your home security purpose. The alarm will be activated when someone touch the metal door knod. This circuit wont work on full metal door. Download the schematic drawing This is door knob touch alarm for your home security....
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This is the circuit diagram electronic door lock security key system. It means that this security system circuit is the combination of pressed key itself (not the mechanical), the output can be connected to drive the relay to open the door....
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Electronic Door Release Circuit This circuit is designed to operate an electrical door-release mechanism - but it will have other applications. Enter the four-digit code of your choice - and the relay will energize for the perio....
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This is Electronic Siren circuit diagram. The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors are off. When the push button switch is presse....
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This is the fire alarm circuit which use LDR to sense the smoke from the fire, so it can be used to detect any dark smoke. With the onset of summer season, possibilities of fire accidents go up. These fire accidents could be prevented if ti....
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Keypad Controlled Switch No2 Circuit The circuit is drawn with a 12-volt supply - but it will work at anything from 5 to 15-volts. All you have to do is choose a relay suitable for the supply voltage you want to use. Replace the....
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Here the simple schematic of multitone siren alarm circuit. This multitone siren is effective for reverse horns, burlgar alarms, and many others. It generates five various audio tones and is much more earcatching than a single-tone siren. T....
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This is the special circuit design of power supply failure alarm. The vast majority of the power supply failure alarm / indicator circuits require a independent power supply for themselves. However the alarm circuit introduced right here re....
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The following diagram is a very easy and simple electronic combination lock based on IC LS7220. Component Part List: C1 = 1uF 25V C2 = 220uF 25V R1 = 2.2K Ohm Q1 = 2N3904 / 2N2222 D1 = 1N4148 / 1N4001-1N4007 K1 = 12V SPDT Relay / Any approp....
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Two Simple Relay Based Motorcycle Alarms Circuit These are two - easy to build - relay-based alarms. You can use them to protect your motorcycle - but they have many more applications. If you use relays with 6-volt coils - they`....
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Vehicle Anti-Hijack Alarm No3 this circuit was designed primarily for the situation where a hijacker forces the driver from the vehicle. If a door is opened while the ignition is switched on - the circuit will trip. After a few....
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Here the wailing alarm circuit diagram: Component parts List: R1,R5 4.7KR2 47KR3 10KR4 100KRx *see text C1,C4 100uF/25V, electrolyticC2,C3 0.01uF (10nF),....
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This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and receiver modules. This circuit works on FM radio waves. Car alarms can be used on vehicles that have a 6-12VDC power supp This circuit is a....
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The following diagram is the circuit diagram of 20W power amplifier which build based tube component EL34. EL34 is very famous tube and great for power tube amplifier. The circuit above is complete circuit contains tube amplifier circuit di....
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This is high fidelity, high quality audio amplifier circuit diagram. You dont need pre amplifier. Component list: R1,R4 = 47K 1/4W Resistors R2 = 4K7 1/4W Resistors R3 = 1K5 1/4W Resistors R5 = 390R 1/4W Resistors R6 = 470R 1/4W Resistors R....
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This circuit is inexpensive, easy and quite simple. This is general audio amplifier which can be used for computer, CD player or other devices which have headphone output. The circuit was deliberately designed using no ICs and in a rather o....
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The following diagram is the circuit diagram of 20 band stereo graphic equaliser which will controlling the audio signal in specific frequency range. This circuit must be connected before the amplifier circuit. For maximum performance, you....
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This is a stereo audio amplifier for your car. The circuit is powered by a single IC TDA1553 with some external components, this IC will handle your stereo car audio system. The TDA1553CQ is a monolithic integrated class-B output amplifier....
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This 3 band equalizer circuit is an active filter network for bass, mid and high audio ranges. It is designed around the LM833 opamp from National Semiconductors. This opamp IC has the following charactersistics: very low noise figure, wide....
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Here the schematic diagram of 70W power amplifier with MOSFET for your audio system. There are possible alternative input stage transistors, the Toshiba 2SA970BL and 2SC2240BL, which appear to be good substitutes for the Hitachi 2SA1085E an....
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This is a A/B Box pedal schematic for electric guitar was designed by Rick Barker. This A/B Box effect was originally designed for switching between different harmonica mics. This A/B Box featured low noise dual preamp for better effect....
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The Adjustable Timer circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds. The time period is set....
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This one transistor audio mixer is used in an amplifier circuit design with base driven transistor and with its emitter being current controlled, most of the driving current flows through the collector away. Using the values in the audio mi....
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This audio noise filter circuit is a bandpass filter for audio frequency band. It filters unwanted signals that are lower or higher than the audio frequencies. It has 2 filters: a low pass filter and a high pass filter in a cascade configur....
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Electronics Circuits Reference Archive Audio preamplifier circuits There are thousands of pre-amplifier circuits. These are three which have interested me and are a little different. Intercom preamp A very convenient way of making an interc....
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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 two identical integrated preamp circuits. The second preamp is used in identical manner This mic preamp....
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This is the schematic diagram of Electro-Harmonix Small Stone Phaser guitar effect pedal. The Small Stone is somewhat special in applying Operational Transconductance Amplifiers (OTA s) for phase shift stages rather of opamps with variabl....
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This easy electronic buzzer circuit built based on timer works for gaining the frequency. The IC timer NE 555 used as astable multivibrator operating at about 1kHz and produces a sound when switched on. The sound frequency can be adjusted b....
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FM Booster, Active FM Antenna Amplifier This FM booster that can be used to listen to programmes from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. (Only C....
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FSK or Frequency-Shift Keying is a form of frequency modulation in which the modulating signal shifts the output freq. between predetermined values. If problems arise in demodulating FSK signals, it is helpful to use the FSK filter circuit....
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The transmitter offers a optical link (infrared) for headphones. Three infrared leds (ir) are polirised by T1 current, P1 is used to adjust the current level. Current consumption of this headphones infrared transmitter is about 60mA at 9V....
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You probably know that LM317 IC is used as an adjustable voltage regulator, but did you know it can be used as an audio amplifier? This is a class A audio amplifier built with LM317 that delivers a maximum 1W audio power. Use a good heatsin....
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Here the simple mixer with 4 input and 2 op-amps: A basic mixer suitable for mixing microphones or even effects outputs. The overall gain from input to output is one if the pot related towards the input is full up. You can make this a net g....
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Zetex Semiconductors have a siren driver IC Type ZSD100 available that is suitable for use in alarm systems for cars and model craft. With the addition of only a few components as shown in the diagram, the device produces an ear-splitting s Zetex....
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This is a stereo VU booster circuit diagram based on transistor FCS9014 which usually used for pre-amp and regulator circuit. This circuit should be connected to audio channel before amplifier module. If you are using tone control or equali....
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This stereo amplifier is for car purpouse and can deliver up to 2 x 22W using a single TDA1557Q or TDA1553Q from Philips. TDA1557Q TDA1553Q datasheet More audio car amplifier circuits....
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TDA 2030 audio amplifier can output 20 W but in this schematic we have reduced the power to 8w and we use 10w speakers. The input sensivity is around 200mV and the amplifier is set by the 47k and 1.5k resistors. TDA2030 amplifier circuit di....
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Join the forum discussion on this post This is a simple home telephone ringtone generator circuit which is built with applying only several electronic components / parts. It generates simulated telephone ringtone and requires only DC supply....
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This is the circuit diagram of UHF band TV antenna booster with 15dB gain power. This low cost antenna booster is simple and easy to build. This circuit formed based on BF180 UHF Transistor. The first stage is an band pass filter constructe....
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This dc voltage doubler circuit produces a voltage that is twice its voltage supply. This is useful when a higher voltage level is needed out of a single lower voltage power supply. Since the current consumption levels are low in such cases....
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Automatic Headlight Brightness Switch Circuit Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your hea....
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Automobile Interior Lights Fader Circuit diagram Circuit This circuit is similar to the fading eyes circuit above and is used to slowly brighten and fade interior lights of older cars. The circuit is based around the LM324 low p....
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Battery Indicator Circuit For The Caravan Circuit This i-TRIXX circuit can prevent a whole lot of trouble for those of you who go on holiday in a caravan. It would be a significant damper on your holiday spirit when you are read....
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The following diagram is the schematic diagram fo Car Horn, you may try this circuit for your car modification Components List: R1 = 68K R2 = 2K2 R3 = 56K R4 = 3K3 R5,R6 = 4K7 R7 = 10K Pot/trimpot C1,C2 = 22nF C3,C5 = 100nF C4 = 1nF C6 = 22....
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Park Aid Three LEDs signal bumper-barrier distance Infra-red operation, indoor use Circuit diagram: Parts: R1 10K 1/4W Resistor R2,R5,R6,R9 1K 1/4W Resistors R3 33R 1/4W Resistor R4,R11 1M 1/4W Resistors R7 4K7 1/4W Resistor R8 1K5 1/4W Res....
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Car and Motorcycle Battery Tester Circuit Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charged lead acid battery and a power....
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Economy radar detector Circuit diagram This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar signal. The first op-amp forms a current-to-voltage converter and the second op-amp buffers the output to....
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LED 12 Volt Lead Acid Battery Meter Circuit In the circuit below, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage....
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Motor Bike Headlight Controller Circuit Circuit This circuit automatically turns a motor cycle`s headlight on and off, independently of both the light and ignition switches, provided the battery is fully charged. The first stage....
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Simple but reliable car battery tester Circuit diagram This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almo....
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Speed-limit Alert Wireless portable unit Adaptable with most internal combustion engine vehicles Circuit diagram Parts: R1,R2,R19 1K 1/4W Resistors R3-R6,R13,R17 100K 1/4W Resistors R7,R15 1M 1/4W Resistors R8 50K 1/2W Trimmer Cermet R9 470....
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Here the circuit diagram of simple and easy made battery level indicator. In general, in mobile phones, the battery levels is displayed in dot or bar style. This helps you to effortlessly acknowledge the battery level. On this page we provi....