Found in old documentation, this circuit is tuned to pass signals below 245 Hz with a level of 0.044 dB above 500 Hz.
This dimmer constrols the temperature of a wire used to print images in wood or other materials....
Found in a Popular Electronics from the 90s, this circuit provides 100 W of power. The power...
We found this circuit in an old documentation. Transistor can be BC548 and relay according to...