This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical and the operational amplifiers can be 741.
This circuit is from an old Motorola manual (1999) using an integrated circuit that is not very...
The circuit is Motorola's 1974 Unijunction Trigger Circuits for Gated Thyristor. A 2N2646 can be...
This RF circuit measures transmission power from 0.25 W to 10 W. The maximum frequency depends on...