3-channel preamp (T484E)

This 4-tube circuit was found in an American publication from 1947. It is intended for audio distribution lines using a transformer source.

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PNP Constant Current Source (CB1242E)
The load current can be adjusted up to about 1 A. The transistor can be TIP32 or TIP42. The...
Diac Voltage Sensor (CB12992E)
The circuit shown in the figure is triggered by an input voltage determined by the setting of P1....
Function Generator (CB6359E)
This circuit is from a 1980s Signetics documentation but is valid for modern operating. Next to...