Windscreen Wiper Interval timer (CB6043E)

This circuit was found in a former Popular Electronics. The timing is set on the potentiometer and the relay is sensitive to 12 V.

1 kHz Astable Using the 4070 (CB252E)
This circuit produces 1 kHz square signals using the CMOS IC 4070. The frequency is given by the...
Beta Meter (CB3804E)
This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be...
5 V Suqare Calibrator (CB5348E)
This circuit was found in the National component manual which is not currently simple to obtain....