This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time and the frequency is determined by the crystal. The circuit operates at voltages from 3 to 9 V.
We find this simple circuit that operates at a frequency of 5 to 10 MHz in an old English...
This tester was found in a 90’s Popular Electronics. The integrated circuit is CMOS 4011. The...
We found this circuit in a 1980 publication. It can be applied to Triacs of the TIC series and the...