Switched analog buffer (CB9315E)

This circuit was obtained from an application note from Analog Devices from the 90s. The components are from that time.

Crystal Test (CB13253E)
This circuit tests quartz crystals of frequencies between 100 kHz and 10 MHz. The circuit is from...
Transformerless 12V x 50mA Power Supply (CB4564E)
We found this circuit at a January 1991 Modern Electronics. The magazine no longer exists, but the...
Simple AM radio ZN416E (CB8203E)
The ZN416E integrated circuit is uncommon today. It consists of a complete radio, like the one...