Hobby diy
Dynamic compressor - passive components, no power supply
This dynamic compressor with passive components reduces high signal to a lower, more constant signal. If you look at this compressor schematic , you’ll notice it has no power supply, the required power is obtain thru the output signal.
If you respect the schematic values this audio compressor will output a constant 70mV when the input [...]
Electronic cricket insect sound circuit schematic
Many people like the cricket sound specially if they live in a big town. This electronic cricket sound works in pulses, so the battery life is prolonged, the current consumption is just 2mA.
The electronic cricket schematic is very simple, it is build with CD4049 or CD4009 wich is CMOS Hex Buffers/Converter.
Wireless headphones transmitter circuit schematic
This wireless headphones transmitter assures a quality reception over 2 meters. The oscillator frequency is between 1750KHz and 3500KHz and for antenna we use a ferrite bar. IC1 amplifies the audio signal and TC1 is a buffer. D1 signals that the transmitter is on and is a voltage stabilizer for the oscillator .
L1 is a [...]
