Pre-stabilization circuit (CB8802E)

Found in Philips' 1968 documentation, this circuit serves as a 6.3 V reference for high stability.

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RIAA Amplifier (CB8939E)
This circuit is from documentation from Analog Devices from the 90s. The circuit uses operational...
Voltage Relay (CB4151E)
This circuit causes the relay to be energized when the input voltage exceeds the voltage value of...
Ultrasonic Motion Detector (CB21310E)
Found in Popular Electronics from the 90s, this circuit is based on a PLL567 and employs high-end or...