Two-tone solar buzzer (CB20493E)

This circuit was found in a 1991 publication. The transistor can be a general-purpose type.

250 mW Amplifier with Bass Suppression (CB14578E
) The integrated circuit used is uncommon today. The circuit is suggested by Motorola's Linear...
Broadband FM FSK Receiver MC13055 (CB14569E)
We found this circuit in Motorola's 1990 Linear Databook. The component used is unusual. The...
Simple RF wattmeter (CB3892E)
This circuit, found in US documentation, can measure the power of transmitters up to 10 W, given...