This negative resistance circuit was obtained from a 1969’s American documentation. It can be made from modern components. See the characteristic obtained.
This circuit has a start and reset switches and can generate signals at long intervals determined by the...
November 2016 - Texas Instruments' new TPS62135 and TPS621351 step-down converters with a wide...
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...