This TTL circuit was found in an American documentation from the 80s. The components are common in the series and the supply must be made with a voltage of 5 V.
The diodes of this circuit are general-purpose, and the base resistors are typically between 2k2...
This electronic Morse key was found in a Popular Electronics from the 90's. The components are common,...
This well-known oscillator configuration that produces a siren sound when pressing CH1 is from a...