Microphone preamp (CB22043E)

This preamp was found in an old English publication. Any usage JFET can be employed. The output is high impedance.

Telephone Amplifier II (CB19340E)
We found this telephone amplifier in a European publication from the 1980s. The transistor can be...
1.3 Ohm Analog Switch (CB15566E)
In figure 1 we have an application for NLAS5113, a new device from on Semiconductor...
Current Booster (CB6973E)
We found this circuit in a Popular Electronics from the 90s. Transistors can be modern...