This circuit was found in a1980s Motorola documentation. The integrated circuit is from that time. The frequency depends on the crystal.
Originally created to feed the filaments of a 12AX7 as an audio preamplifier to eliminate the...
In the figure we show how to implement a TTL photo-trigger with the 7413. This circuit can be used...
Found in old documentation, this circuit consists of a simple power source where the transistor must be...