This circuit is from a 1980s Motorola documentation. The circuit can be set to fire from 60 to 120 V DC or from 42 to 84 V AC. The circuit has a forehead button that activates an indicator lamp.
This TTL module can be used in counter and many of them can be cascaded to counts up to 99, 999,...
We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit...
We found this circuit in a 1989 publication. Its purpose is to produce noise in the VHF or UHF...