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.

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Broadband active antenna (CB7456E)
This circuit was obtained in an Electronic Design from the 90s. The circuit uses transistors from the...
Rain Alarm (CB5366E)
This circuit appears elsewhere in this section, but taken from other sources. This is an English...
Fixed Gain Amplifier LM381 (CB25275E)
This circuit was found in the February 1990 issue of Radio Electronics magazine. The gain is given...