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3D Printer Filament Measuring with Arduino

Enrico takes us through his solution to ensure that he always knows how much filament is left on his roll. An Arduino and a load cell combined with some ingenious code are all that is needed.
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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