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Fake Car Alarm Circuit 19 Apr 2013 | 07:55 am
This simple fake car alarm or alarm decoy circuit device will simulate the presence of a burglar alarm in automobiles or homes. It has a few components, uses LM3909 and is easy to build. Mount R1 wher...
27MHz CB receiver circuit 18 Apr 2013 | 07:20 am
This is a simple 27MHz FM-CB receiver circuit built with TCA440 for listening CB ( citizen’s band ) transmissions with FM (frequency modulation). The selection is made with ceramic filters. This 27 MH...
Electronic dog whistle circuit 18 Apr 2013 | 07:15 am
Need electronic dog whistle? It is widely known that dogs can hear sounds with frequencies higher than the humans cant hear. Sound frequencies higher than 20 kHz can be hardly detected by humans but a...
TDA2050V HiFi amplifier 17 Apr 2013 | 08:14 am
This circuit uses a high quality audio amplifier IC in a 5-pin TO220 package that does not require insulating washers between the metal tab and heatsink in single rail supply applications. The amp can...
Electronic bongos 17 Apr 2013 | 08:11 am
This circuit consists of twin-T sine-wave oscillators. Each oscillator has a filter in the feedback loop. If the loop gain is greater than unity, the circuit will oscillate. Gain is adjusted to be jus...
Simple 555 Vco 17 Apr 2013 | 08:07 am
The VCO has an output frequency that ranges from 1500Hz at V;,= 1 V to 300Hz at V;,=5 V. R1 or C1 can be varied to change th MAX690ACSALXT970AHCMAX1232ESAISPLSI1016-60LJLMC660CMLM311MMAX706TCSAMAX1602...
Amplified Noise Limiter For Sw Receivers Circuit 17 Apr 2013 | 08:04 am
The noise limiter circuit has a preamplifier clipper, and a switchable audio bandpass filter. Audio levels in the 5- to 50-mV range are amplified in a preamp to several volts p-p, fed to a clipper, vo...
Infrared Receiver circuit with BPW41N 16 Apr 2013 | 08:02 am
This infrared receiver is used with this infrared transmitter. The output signal of D1 IR diode is amplified by IC1. The diode is BPW41N works great with the transmitter and is relatively fast (~200 n...
Linear Optocoupler Circuit 16 Apr 2013 | 08:00 am
This linear optocoupler is built with MOC5010 and can be used to isolate a circuit from main grid, audio interface, in medical electronics and many other applications. Because of its high isolation re...
Spy Telephone circuit Schematic 16 Apr 2013 | 07:54 am
This FM spy telephone circuit is mounted serrial with the phone line. When is signal on the wires thistransmitterwill radiate airwaves thru the wires wich act as anntenna. There is no need for batteri...
