We found this circuit in the August 1994 issue of Electronics Now magazine. The circuit is based on the now uncommon CMOS 4046. The frequency range is given by C1.
The instrument of this field strength meter, from a 1970s publication, can be a 200 uA...
We found this circuit in the ON Semiconductor Thyristor Manual although similar configuration can be found...
A very interesting integrated circuit for step-down converter designs (voltage reducers) with an...