I finally got round to making my capacitor ESR tester this week after finding a nice simple 5 transistor version. Unfortunately, for me, the design was only SMD so, I decided to replicate his schematic in Eagle PCB using a through hole component design. I will not be going into much detail regarding ESR or Equivalent Series Resistance Meters as, there is already plenty of other sources of information on the subject. Yet, every tinkering knows capacitors are guilty of a lot of sins in electronics. Capacitors love to throw red herrings! They can appear physically fine (no bulge), show good capacitance and hide in circuit, standing to attention like the Queens Guards hiding shorts and high resistance under their big hats. This is where the ESR tester can be a saviour, with the ability to test for "out of specification" high resistance, within the capacitor. They can also be used to test "in circuit", without the need to remove every capacitor in the circuit.

     ESR Meter / Transistor Tester
     10Hz - 60MHz Frequency Meter / Counter
     40MHz 32 Channel Logic Analyser
     10Hz - 60MHz Frequency Meter / Counter
     ESR & Low Resistance Test Meter
     Field Strength Meter
     ESR Meter
     A Low-Cost 50MHz Frequency Meter
     ESR Meter
     Simple EMF Probe

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