This circuit was found in a 1966 General Electric documentation. The circuit makes use of PUTs that are uncommon components today. Counting direction depends on the programming in A and B.
Circuits similar to this appear elsewhere in this section. The transistors can be BC549 (low...
September 2017 - Vishay Siliconix SQ MOSFETs for automotive use are in stock for immediate...
In this circuit we show how to modulate the pulses produced by a 555 in frequency. The circuit can be...