Simple 5V regulator (CB8815E)

This simple 5.6 V regulator circuit was found in a 1966’s Philips. The zener can be changed to obtain other voltages.

Musical doorbell (CB9210E)
This musical doorbell was found in a Popular Electronics from the 90s. The U4 melody generator...
Bidirectional Current Monitor (CB5265E)
This circuit was found in a 2005 Linear Technology application manual. The circuit is based on the...
Varicap Controlled Oscillator (CIR819E)
This oscillator produces a signal with a central frequency in 1 MHz. This frequency can be...