Rectangular Oscillator 555 (CB21721E)

This circuit was obtained from an internet documentation. The LED is inverted in the original, and the frequency depends on the selected capacitor.

Testing remote controls (CB7027E)
This circuit was found in an old Popular Electronics. With it we can check the operation of a...
Bridge Amplifier (CB25888E)
This circuit can be used in measurement bridges. We found it in the September 1995 Electronics Now magazine....
Temperature Alarm (CB6111E)
This circuit is from a 1965 General Electric publication. It uses a thermistor to fire a reed...