We found this circuit in the April 1993 Electronics Now magazine. Almost any general-purpose JFET can be used. Power is supplied by a battery (2 x 9V).
Using the 723 integrated circuit, this power supply has the voltage determined by R2 and R3, which...
Using the ULN-3784B this circuit typically supplies 5 W at 24 W. However, it can operate from 9 V....
Suggested by the General Electric Hobby Manual of 1965 this circuit measures voltages from 0 to...