Modulator Amplifier (V1574E)

This circuit is from a 1938 tube manual. Transformers are the critical components. Component values are given.

CMOS to TTL converter MC1489 (CB14557E)
This circuit is from Motorola's Linear Databook from 1990. The integrated circuit used is no...
Latching relay (CB25722E)
The figure shows how to connect a relay to obtain the latch effect. The circuit is from an...
High impedance amplifier (CB7449E)
Suitable for the use with sensors, this circuit from National Semiconductor appears in other...