Night switch (CB8280E)

Found in a 1964 Philips manual, this circuit uses only passive components. The relay is a high voltage sensitive type.

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Full wave dimmer (CB7208E)
Found in Motorola's 1965 manual, this full-wave dimmer controls a load that depends on the used...
Linear Summing and Differentiating Circuits (CB20147E)
The two adding and differentiating circuits with operational amplifiers given below were obtained from...
Digital Windshield Wiper Timer (CB24567E)
This sophisticated circuit was found in the November 1978 issue of Radio Electronics magazine. Based on...