Crystal oscillator (CB9504E)

This circuit was found in a 90s Popular Electronics. It can generate signals from 3 to 10 MHz.

High Voltage Regulator (CB16679E)
This circuit is based on an integrated TIPL62 from Texas Instruments, uncommon today and an...
3 Tone Oscillator (CB4187E)
This circuit appears in other articles and suggestions for circuits in this section from other...
Precision PWM Generator (CB21335E)
This circuit was obtained from an Electronic Design from the 90's. The circuit generates signals at a...