Single pulse indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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When checking the performance of devices on integrated circuits, it becomes necessary to indicate the passage of a single pulse. It is difficult to register the appearance of a single pulse, sometimes very short, a few tens of nanoseconds, even with the help of special oscilloscopes.
On fig. 1 shows a schematic diagram of a simple indicator of the appearance of a single negative pulse.
Ris.1
Elements D1.1 and D1.2 form a trigger, to one input of which the output of the device under test is connected, and to the other - through the S1 button - a logic zero voltage is applied, which returns the trigger to its original state.
Before starting work with the indicator, set it to its initial state by briefly pressing the button S1. If we now connect the indicator to the device under test, then the first pulse received at the input will switch the trigger to another stable state and the lighting of LED V1 will mark the appearance of the pulse.
In the indicator of a single pulse, you can use the K155LA3 chip and the KL101B or KL101V LED.
Literature
- "Elektrotehnicar" (SFRY), 1976, No. 7
Publication: N. Bolshakov, rf.atnn.ru
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