Procedure for Testing PCBs Using a Multimeter
A multimeter is a versatile device used for measuring voltage, current, and resistance, essential for diagnosing circuit board faults.
voltage
Identifying SMT & Power Short-Circuit Failures on PCBs: A Quick Guide.
1. A simple method to facilitate testing and repair of small SMD components involves binding sewing needles to multimeter test pens with thin copper wire, reducing short circuit risks and enabling direct contact with coated pins. 2. In circuit board maintenance, detecting short circuits in common power supplies is crucial. “Ground hoeing” may work for boards with fewer components, but for denser boards, a method involving an adjustable power supply is more efficient. Gradually increasing the current while monitoring heat can help pinpoint faulty components.
Identifying SMT & Power Short-Circuit Failures on PCBs: A Quick Guide. Read More »
Voltage not equal to zero across opamp inputs in LTSpice
Simulation of modified follower circuit in LTSpice 4.20 with unexpected voltage discrepancy. Ideal op-amp model used with 1MHz GBW and 100dB Aol. Issue with 10mV input causing 10kV output instead of 10V. Investigating offset voltage source.
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The low voltage power off protection circuit is unable to achieve high voltage recovery output.
Design low voltage automatic power off circuit, output off when voltage < 9V, restored when > 9V. Software simulation normal, actual test failure.