This precision circuit was found in ancient American documentation. The most critical component is the PMOS transistor. The power supply must be symmetrical.
This VCO or Voltage Controlled Oscillator uses common components. TR1 can be a BF245 and TR2 a...
This control for a heating element was found in an old documentation. The current in the element...
By pressing and releasing PB1, only one LED is lit, drawing a number from 1 to 6, as in a die. The...