Telephone amplifier (CB8630E)

This circuit uses a pickup coil to take the signal from a telephone line without contacts. The circuit is from a 90s Popular Electronics.

| Clique na imagem para ampliar |

Telephone amplifier with LM386 IC (CB967E)
The circuit shown is only for analog telephone lines. I found it in Popular Electronics (1991). It...
High Impedance Differential Amplifier LM158 (CB4479E)
Three LM158, LM258, LM358, or LM2904 operational amplifiers are used in this instrumentation amplifier....
LM3600 Bias Control (CIR25148E)
The figure shows a way to apply gain control to the LM3600 OTA. The circuit is from a Radio...