This circuit generates signals whose frequency depends on C1 and C2. JFETs are common types like BF245 or MPF102.
The idea of this automation can be extended to other applications that involve the control of...
What differentiates this circuit from the previous one (CB15613E) is the non-need to use a...
Found in Elektor Electronics from the 90s, this circuit produces the tone of 1 750 Hz for calling VHF...