This circuit was obtained in a 1969 Mullard manual. The transistors are from that time. The input sensitivity is 300 mV.
This Set-Reset (RS) flip-flop uses an integrated 4001 or 4011 in addition to some external...
This is the basic configuration of the LM339 as a comparator, requiring a 3k (3k3) pull-up...
This circuit is a siren with manual modulation that, instead of exciting a speaker, excites...