455 kHz modulator with the 555 (CB7990E)

This circuit has a configuration that can be found elsewhere on this site. The power supply can actually be between 5 and 12 V.

Zero Crossing Detector (CB4000E)
This detector is from the 1990 Motorola Dataar Databook, but can be adapted to work with more...
Basic dimmer with triac (CB25882E)
This circuit is from an Electronics Now from August 1995. The triac is according to the load that...
Intercom (CB6844E)
This circuit is from a Hands-On Electronics from the 90s. The integrated amplifiers used are well...