Open-Source Light Meter

T. K. brings us a brilliant open-source light meter with OLED display. This Arduino project may not illuminate the way, but can tell you how bright it is!
dynamic microphone amplifier circuit schematic

Low Noise Dynamic Microphone Amplifier Circuit

Received by Email - 04/26/2008

This dynamic microphone amplifier circuit has a total gain of 200 times. If we use 200Ω microphones R4 [...]

Infrared Headphones Receiver Circuit

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Use this infrared headphones receiver with the ir headphones transmitter. Use 600Ω headphones. BPW41N and BP104 have a [...]
headphones infrared transmitter

Infrared Headphones Transmitter Circuit

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The transmitter offers a optical link (infrared) for headphones. Three infrared leds (ir) are polirised by T1 current, [...]

CB 27MHz Transmitter Circuit

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NBFM or Narrow Band Frequncy Modulation is used in this 27 MHz transmitter circuit schematic. This circuit is [...]
high power 200W audio amplifier

200W Hybrid Audio Amplifier Circuit

Received by Email - 04/24/2008

Connecting two TDA2030 thru cheap power transistors we can create a amplifier wich can deliver a higher power. With the components value from the schematic the total amplifier gain is 32 dB. The speaker can [...]
strobe light circuit schematic

Strobe Light Project Circuit

Received by Email - 04/20/2008

Attention! This strobe light circuit is connected to 220V, so measurements and experiments are very dangerous even after [...]

LM338 12V Power Supply Circuit

P. Marian -

This ac to dc power supply can output 5A in continous operation and 12A peak current. This kind [...]

STK4241V Stereo Audio Amplifier

P. Marian -

This Home Stereo audio amplifier is equiped with STK4241V wich is a thick film hybrid IC, AF Power [...]
electronic pest repellent schematic

Electronic Mice Repellent Circuit

P. Marian - 04/17/2008

This electronic mice repellent emit high frequency sound waves to create an acoustically hostile environment that effectively repels [...]
electronic door lock circuit

The Simplest Electronic Door Code Lock Circuit

P. Marian -

This is the simplest electronic door lock that has a remarkable code implementation because it uses only one active component and at least 8 button switches. How does the door code lock circuit work? To [...]

FM Dipole Antenna

P. Marian -

DIY FM dipole antenna or half wave antenna are the most used because is easy to build and [...]

300W FM RF Amplifier Circuit

P. Marian - 04/14/2008

This 300W RF power amplifier for your fm transmitter has 2 x TP9383 transistors. 300W radio power amplifier [...]
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