Astable 555 (CB21101E)

This 50% duty cycle configuration was found in a Popular Electronics from the 1990s. The operating frequency is given by C1.

Servo Test (CB11388E)
The circuit presented generates pulses at regular intervals with the duration controlled by a...
555 testing generator (CB21341E)
Found in Electronics Now, this circuit generates signals for testing like a signal injector. The...
Neon Flasher (CB20941E)
This simple expandable circuit was obtained from a Popular Electronics from the 80's. The supply...