The simple Diode ... LED on the unit would light. The astable multivibrator would also stop oscillating in this case, but this is not a problem. If the diode being tested were open-circuit both ...

The base forms the input and its bias circuit is identical to that of the ... the base-emitter junction of a transistor is also a diode, it will always maintain approximately the same voltage ...

A boost converter is commonly used to step up the voltage to a level high enough to bias the ... protection circuit shown utilizes R9, causing it to serve an additional function, in conjunction with ...