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John Gragg

check your PM …..in the mean time here is a basic design  which should be much better than just a basic  30$capacitance meter

I have not built this one but it should be ok.  About as basic as you can get

The circuit will generate probably  150 volts of DC  from household current .   Dangerous voltages/currents are limited   with  2 x  560 k resistors.   The diode will  rectify and alllow houselod on AC peaks (approx 150v)  to reach your    capacitor under test .

the parts can be simply  be installed in a small aluminum box for mounting the bulb and  probes . use a 3 wire cord to ground the box.

Mr  Mohat’s test box #1  basically works the same way  except he used 2  diode to create a voltage doubler to reach about 300v

voltage doubler designs are everywhere on the Net if you want to go 300 volts

when connecting a outboard capacitor to it  and  if leakage   turns on the neon bulb …  it is bad ! ”   simple test !

as always  proceed with caution  if not confident  with  such voltages …  !!! other wise get your brother in law to build it 🙂

crosbyman wrote:

interesting..   thanks for heads up on this one.

I looked it up  works with 9v olt battery and hopefully    9 volts   is boosted way up there to test the capacitors .

no AC cord ” power” to deal with .. nice and compact

probably a must have   for testing outboard  capacitors.  not expensive to !  nice design

CLT Model 3G Capacitor Leakage Tester Guitar Amp repair Fender Marshall Vox + | eBay

 

 

 

I asked the seller if it would work on the capacitors we commonly use and he just got back to me.He said it would on any under .33uf and capacitor needs to have one “end “ disconnected and be discharged just like you’d assume.Seems like a good deal for those without a Merc o tronic,Stevens etc.

crosbyman wrote:

check your PM …..in the mean time here is a basic design  which should be much better than just a basic  30$capacitance meter

I have not built this one but it should be ok.  About as basic as you can get

The circuit will generate probably  150 volts of DC  from household current .   Dangerous voltages/currents are limited   with  2 x  560 k resistors.   The diode will  rectify and alllow houselod on AC peaks (approx 150v)  to reach your    capacitor under test .

the parts can be simply  be installed in a small aluminum box for mounting the bulb and  probes . use a 3 wire cord to ground the box.

Mr  Mohat’s test box #1  basically works the same way  except he used 2  diode to create a voltage doubler to reach about 300v

voltage doubler designs are everywhere on the Net if you want to go 300 volts

when connecting a outboard capacitor to it  and  if leakage   turns on the neon bulb …  it is bad ! ”   simple test !

as always  proceed with caution  if not confident  with  such voltages …  !!! other wise get your brother in law to build it 🙂

Any reason this unit couldn’t be built using a “non conductive” box
instead of aluminum? Thanks.