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Two Transistor Wien Bridge Oscillator
2008-01-27 06:15:00 Here is a two-transistor Wien bridge oscillator using an ordinary night-light bulb for stabilization. The output is about 6 volts p-p and can drive fixed loads as low as 2 or 3 thousand ohms without additional buffering. A 10 k amplitude potentiometer with the wiper going to a high input impedance ... More About: Bridge , Transistor , Frequency
Audio Phase Shift Oscillators
2008-01-25 05:54:00 Here is a phase-shift audio oscillator with excellent distortion characteristics thanks to “softened” diode limiting provided by the 1N914 and resistor divider and degenerated gain provided by the 68 ohm emitter resistor. For minimum distortion, increase the 68 ohm resistor to a point just below where oscillation stops. A simple buffer ... More About: Audio , Shift , Phase , Frequency
Crystal Radio (and other purpose) Audio Amplifier
2008-01-23 18:53:00 Here is a simple audio amplifier using a TL431 shunt regulator. The amplifier will provide room-filling volume from an ordinary crystal radio outfitted with a long-wire antenna and good ground. The circuitry is similar in complexity to a simple one-transistor radio but the performance is superior (with the exception of the ... More About: Radio , Audio , Sound , Crystal , Purpose
Op-Amp Audio Amplifier
2008-01-21 18:33:00 In the below circuit is a versatile audio amplifier employing a low cost LM358 op-amp. The differential inputs give the amplifier excellent immunity to common-mode signals which are a common cause of amplifier instability. The dotted ground connection represents the wiring in a typical project illustrating how the ground sensing input ... More About: Audio , Amplifier
4-Transistor Amplifier for Small Speaker Applications
2008-01-20 18:21:00 The circuit below shows a 4-transistor utility amplifier suitable for a variety of projects including receivers, intercoms, microphones, telephone pick-up coils, and general audio monitoring. The amplifier has a power isolation circuit and bandwidth limiting to reduce oscillations and “motorboating”. The values are not particularly critical and modest deviations from the ... More About: Applications , Speaker , Small , Amplifier , Transistor
Computer Audio Booster
2008-01-18 17:54:00 Here is a simple amplifier for boosting the audio level from low-power sound cards or other audio sources driving small speakers like toys or small transistor radios. The circuit will deliver about 2 watts as shown. The parts are not critical and substitutions will usually work. The two 2.2 ohm ... More About: Audio , Computer , Booster
Simple LM386 Audio Amplifier
2008-01-16 17:24:00 This simple amplifier shows the LM386 in a high-gain configuration (A = 200). For a maximum gain of only 20, leave out the 10 uF connected from pin 1 to pin 8. Maximum gains between 20 and 200 may be realized by adding a selected resistor in series with the same 10 ... More About: Audio , Simple , Amplifier
FET Power Amplifiers - MOSFET Output Power Amplifier
2008-01-14 04:38:00 Although there are a few, all MOSFET power amplifiers are uncommon. Most use a combination of bipolar transistors (for the input and gain stages), and MOSFETs for the output devices. This seems to be the most popular circuit arrangement, so I will concentrate on this. Figure below shows a fairly typical arrangement ... More About: Power , Amplifiers , Amplifier , Mosfet
FET Power Amplifiers - Single Ended MOSFET Class-A Amplifier
2008-01-12 04:27:00 In exactly the same way as a power valve can be used in single-ended Class -A, so too can a MOSFET. A simple circuit is shown in Figure below which will provide about 10W of audio. Using a constant current source as a load (as shown) gives much better efficiency than a resistor, ... More About: Power , Single , Amplifiers , Amplifier
FET Current Amplifier
2008-01-11 04:21:00 Again, I have shown both a junction FET and a MOSFET in Figure 3.3, both common-drain or source-follower circuits. As can be seen, the junction FET is biased almost identically to a valve, but all voltages are much lower. The MOSFET requires a positive voltage, and this must be greater than ... More About: Current , Amplifier , Mosfet
Modules For Mono Input Channels
2008-01-10 12:33:00 A simple choice appear in the Fig. below, in asymmetrical [ unbalance ] connection of input. It uses integrated circuit [ IC1 ], in inverting and possibility of regulation gain of unit, for low levels [ microphone ] up to high [ line ]. With switch S1 we can, if it ... More About: Mono , Channels , Input
Field Effect Transistors and MOSFETs
2008-01-10 03:45:00 Now on to FETs and MOSFETs. FET stands for Field Effect Transistor, and MOSFET means Metal Oxide Semiconductor Field Effect Transistor. This topic is something of a can of worms, not because of some deficiency in the devices, but because of the huge array of different types. The basic FET types are N-Channel ... More About: Mosfet
Electronic Balance Mic-Line Input Module
2008-01-09 12:22:00 Below, appears one stage with much better characteristics, in symmetric connection [ balance ], with continuous regulation of stage from the potesometer 22KŮ. This give the possibility for regulation of sensitivity, from low input levels until high. And in this circuit I do not give concrete type for the IC1-3. The ... More About: Electronic , Balance , Line , Module , Input
Microphone Transistors PreAmplifiers
2008-01-07 06:10:00 Below exist two choices for preamplifiers of microphone that use transistor, in asymmetrical [ unbalance ] of input connection. For the supply of this stages, exist two choices. The first choice, are with diode zener, the other choice, use voltages that give the regulators, from main power supply. More About: Microphone
Single-chip RF transmitter/receiver integrated circuits
2007-10-11 17:54:00 MAX1470 315MHz Low-Power, +3V superheterodyne receiver MAX1472 300-450MHz ASK transmitter MAX1473 315/433MHz ASK superheterodyne receiver Atmel T5754 434MHz UHF ASK/FSK transmitter Atmel U2741 300-450MHz UHF ASK/FSK transmitter Atmel U3741 300-450MHz UHF ASK receiver Atmel AT86RF211 400-950MHz programmable UHF FSK transceiver More About: Circuits , Receiver , Single , Integrated , Chip
434MHz ASK/OOK AM transmitter/receiver
2007-10-11 17:52:00 RX3302 super-regenerative receiver module schematic RX3302 super-regenerative receiver module photo X10 RF daughter board - super-regenerative receiver 434MHz short-range communications - article in Elektor 1998/5 SP-Elektroniikka super-regenerative receiver and SAW-based transmitter SAW-based 434MHz transmitter schematic with RO2101 (from appnote below) SAW-based transmitter design appnote from RFM SAWR-based transmitters, EPCOS appnote#1 More About: Receiver , Frequency , Transmitter
Transmitter/Receiver
2007-10-11 17:50:00 27Mhz toy car transmitter/receiver receiver transmitter L1, L4=9 turns, .15mm wire on 4.5mm diameter tunable ferrite coil former, L2=15 turns, .5mm wire, 5mm diameter, L3=3.5 turns, .5mm wire, 5mm diameter 49MHz walkie-talkie schematic More About: Receiver , Frequency , Transmitter
Radio Control 2
2007-10-11 17:47:00 “CLONEPAC” memory module for Futaba 8UAF/8UAP 0-10V control for RC servos 250-amp Speed Control ler for RC cars 27Mhz toy car receiver 27Mhz toy car transmitter A dual alternating flashing light circuit A dual tandem flashing light circuit powered by a 9 volt battery A Receive Signal Decoder Alf: The Robotic Matchbox car Battery low voltage alarm Battery low voltage alarm 2 Battery pack discharger More About: Radio , Frequency
Radio Control 1
2007-10-11 17:39:00 Radio Control Battery Backup RC Receiver Battery Low Voltage Alarm Remote switch for radio-control aircraft accessories RF serial link for robot Robot with PIC16F84 brain & InfraRed eyes Robotic microcontroller board Seaplane schematic Signal breaking module Simple charge rate monitor Simple flashing light circuit Simple flashing light circuit Simple flashing light circuit Simple train detector using ambient light and a photocell Simulate the Gyralite (dual flashing headlights). Snake throat ... More About: Radio , Frequency
Simple Radio Control Transmitter Using HT
2007-10-11 17:30:00 Using IC HT12-E we can Create R/C Transmitter very Easy This IC have 8 Bit address. More About: Radio , Remote Control , Sound , Simple , Schematics
Simple Radio Control Receiver Using HT
2007-10-11 17:29:00 1. RWS Gnd to header-pin #1 2. RWS Vcc to header-pin #3 3. RWS Digital-Output to header-pin #2 HT-12E encoder data transfers ... More About: Radio , Remote Control , Sound , Receiver , Simple |
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