This circuit can use a pendulum sensor. We found this configuration in a 1994 publication. The components used are common and the timing is given by the capacitor C1 which can be changed.
The coils of this simple mid-wave radius are wound 28 or 26 on a 12 to 30 cm long ferrite rod and the...
In the figure we have a battery charging circuit for currents up to about 5 A. In series with the...
Found in 969 documentation, this circuit generates sweep signals from 1 Hz to 100 kHz. The...