We found this circuit generates signals from 200 Hz to 62 kHz and can be used to repel mosquitoes and mosquitoes. The circuit can be powered from 2 small batteries to 9 V battery.
This 3-transistor circuit was found in a Mullard manual from 1960. The transistors are germanium of the...
This low current solenoid driver was found in an ancient American documentation. The solenoid must be...
We found this circuit in GE's 1977 transistors manual. Transistors admit equivalents according to the...