This Schmitt trigger was found in old documentation. The transistors can be of the general-purpose type like BC548 or even 2N2222.
This circuit is from a 1977 publication, serving to produce sound effects in games, as it is...
This circuit measures the RF power of oscillators and small transmitters in the range of 0.05 to...
This ring circuit was found in the April 1959 Radio Electronics magazine. The capacitors are...