2-transistor amplifier (CB26314E)

This amplifier stage was obtained from a Popular Electronics from the 90s. The transistors are general purpose.

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1-Transistor Receiver (CB19269E)
Any general-purpose germanium or silicon PNP transistor can be used on this receiver. The handset...
Momentary indicator (CB22125E)
When this circuit is activated the LED flashes for a moment indicating that the function has been...
Manual Siren (CB13165E)
In the circuit of the figure, when pressing S1 the sound varies according to the value of R2 and...