Constant current source (CB8822E)

This 2mA source was found in a 1968’s Philips documentation. The transistor may be the BC549.

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3-Bit AD Converter (CB9027E)
This fast converter using operational was found in a 70s American documentation. The circuit can be...
Crossing Signal For Railroad Modeling 3 (CB3856E)
This circuit uses two sensors that are placed at the intersection of a miniature railroad, causing the LED...
RF Power Meter (CB4885E)
This RF wattmeter was found in an American 1980s documentation. The components are common and the...