Found in American documentation from the 1980s, this circuit makes use of components of the time, which are uncommon today. The circuit detects the approach using a sensor formed by metal plates.
This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time...
This circuit generates noise pulses for audio equipment probes. The circuit is from a 90’s 303...
This circuit was found in a 1970s General Electric documentation. This circuit already used an...