Pulse generator with delay 555 (CB8922E)

We found this circuit in a Hands On Electronics from the 90s. The delay is given by the formulas next to the diagram.

Wireless Sound Transmitter (CB25156E)
This wireless infrared remote sound transmitter is from an article published in the August 1988...
Wheatstone Bridge (CB25887E)
We found this circuit in the September 1995 issue of Electronics Now magazine. The circuit has 6...
AC Inverter Amplifier LM3900 (CB25166E)
The figure shows how to implement an inverter amplifier with a Norton operational amplifier. The...