Flasher CA3130 (CB22004E)

Found in an English documentation from 1977, this flasher or pulser circuit drives an LED. The frequency depends on C2.

NOR function with Transistor I (CB19890E)
The diodes of this circuit are general-purpose, and the base resistors are typically between 2k2...
Code practice oscillator (CB7311E)
This electronic Morse key was found in a Popular Electronics from the 90's. The components are common,...
Variable Tone Generator - Siren (CB12211E)
This well-known oscillator configuration that produces a siren sound when pressing CH1 is from a...