This circuit was found in the August 1996 Electronics Now magazine. The circuit is based on an operational circuit whose type determines the gains and limits for the frequency.
This circuit was obtained from Radio Electronics from the 90s. The infrared sensor is of an...
This circuit is suggested by Motorola and is based on a 1723 voltage regulator. The 2N3055...
Found in documentation from the 1980s, this circuit generates signals that can reach a few...