We found this circuit in the October 1987 Radio Electronics magazine. The triac must be controlled according to the heater. The transformer has a low current, of the order of a few hundred mA.
This VCO or Voltage Controlled Oscillator uses common components. TR1 can be a BF245 and TR2 a...
This 555-based circuit was found in the August 1976 issue of Radio Electronics magazine. The tone...
The integrated circuit of this project is not very common. The circuit is from 2003. This circuit is...