Auto Bias for FET (CB6125E)

This configuration is from a 1964 US documentation valid for any FET. The range of power voltages depends on the application.

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Two Transistor Adjustable Siren (CB1484E)
This circuit was published in a 1977 Radio Shack catalog. The PNP transistor may be BD135 and NPN...
Texas Instruments Standard Operational Amplifiers
Texas Instruments Standard Operational Amplifiers Texas Instruments makes available through Mouser...
Buzzer (CB6002E)
This circuit produces an intermittent ring tone being triggered directly by the telephone line. However,...