This circuit was obtained in a Popular Electronics from the 90's. The gain depends on R4 and R3. Transistors are general purpose types.
This circuit was obtained in a 1976 English magazine, and can be assembled with equivalent...
This amplifier is from a 1990s Linear Technology component manual. The circuit requires...
This circuit can shift the phase of a signal from 0 to 360º. FETs admit equivalents and the...