This circuit was found in documentation from the 90s. The transistors can be general-purpose equivalents. The circuit has two versions, one that drives LEDs and another that drives a relay as a load.
The diodes of this circuit are general-purpose, and the base resistors are typically between 2k2...
This is one of the many anti-deboucer circuits the reader can find on this site. The base is TTL...
This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency...