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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Transformerless 220 V To 110 V Reducer (CB13909E)
This 600 W reducer uses SCRs and a switching system. The circuit is from Motorola's 1975...
12 to 3 V x 1 A Reducer (CB4844E)
In the figure we show how to use common diodes to get a reference near 3 V in a car gearbox. The...
Sample and Hold (CB24626E)
This circuit using the newly released HA2400 was found in the March 1980 Radio Electronics...