A voltage divider sets a clean reference threshold (approx. 10mV to 50mV above the noise floor) on the inverting pin.
While testing, the flyback voltage from an inductor can exceed 200V. The 1N4148 diodes protect your 555 timer, but accidental contact with the probes during a discharge can give you a nasty bite. Always discharge large inductors before connecting them.
: Partial short, low-Q inductor, or a heavily loaded transformer. (Note: Some very small or high-resistance chokes naturally ring lower).
The circuit operates by treating the inductor under test as part of a resonant tank circuit. : A pulse of approximately
A voltage divider sets a clean reference threshold (approx. 10mV to 50mV above the noise floor) on the inverting pin.
While testing, the flyback voltage from an inductor can exceed 200V. The 1N4148 diodes protect your 555 timer, but accidental contact with the probes during a discharge can give you a nasty bite. Always discharge large inductors before connecting them. blue ring tester schematic diagram exclusive
: Partial short, low-Q inductor, or a heavily loaded transformer. (Note: Some very small or high-resistance chokes naturally ring lower). A voltage divider sets a clean reference threshold (approx
The circuit operates by treating the inductor under test as part of a resonant tank circuit. : A pulse of approximately blue ring tester schematic diagram exclusive