This circuit was found in an 80's Poptronics. The circuit is a fast trigger whose signal can be taken from the Q2 collector. The supply can be done with voltages from 9 to 12 V.
This circuit is used to test capacitors with a working voltage above 150 V, detecting shorts or...
The circuit shown is used to reset TTL logic when power is established. The circuit uses a 7413...
This circuit was obtained in a Motorola manual from the 70s. The integrated circuit is from that...