Tests and Measurement - Circuits - Electronic Blog for hobbyist

Logic Probe

This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. To check the logic level, we must connect the "Test" wire of the probe to the desired node of the circuit that we want to check. ... Read more »

Category: Tests and Measurement | Views: 1102

Beeper to find short circuits

This circuit uses two 741s or equivalent op amp to form a beeper that is used to detect short circuits. ... Read more »

Category: Tests and Measurement | Views: 1083

Expanded Scale Battery Volt Meter

This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery system. It was specifically designed for use in solar powered systems, but is general enough that it can be used for automotive or other 12V systems. Lead acid batteries normally spend their working lifetime in the voltage range of 11-15 Volts. This meter circuit was designed to show the voltage range of 10-15V on an analog meter movement, it can be used to show the battery charge state from empty to full. ... Read more »

Category: Tests and Measurement | Views: 1284

Led display digital Voltmeter

This is an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. ... Read more »

Category: Tests and Measurement | Views: 1420

Digital Voltmeter

Voltmeter measured in range from 0.2V to 2000V ... Read more »

Category: Tests and Measurement | Views: 1495

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