Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => AmpTools/Tech Tips => Topic started by: rake on April 08, 2018, 06:51:29 pm
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Saw Brad The Guitologist on YouTube using the Geekcreit LCR-T4 Mega328
to test capacitors, diodes and transistors so I checked his link to BangGood
but they were out of stock. But I found in on NewEgg! This little bugger seems like
a lot of "bang" for only a few "duckets"
https://www.newegg.com/Product/Product.aspx?Item=9SIA6RP6KB5555&nm_mc=TEMC-RMA-Approvel&cm_mmc=TEMC-RMA-Approvel-_-Content-_-text-_-
Seems like it's gonna be a handy tool.
Mine works fine.
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Take a look at this. He seems to like it.
I bought one off ebay. Seems to be a pretty good quick and dirty tester for most (but not all) components.
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bought one from amazonia dhat com - 15 bux with the case shipped. works well being a KOOKYE thing and all.
https://www.amazon.com/KOOKYE-Mega328-Transistor-Tester-Capacitance/dp/B01GL3B6K2
--pete
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OK, me too. Dummyload made me do it. :occasion14:
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OK, me too. Dummyload made me do it. :occasion14:
eye did? oh, i.c., blame the dummy! :icon_biggrin:
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It's up & running. Didn't realize the board came fully assembled. Just had to build the clear acrylic box housing.
Seems to work as advertised. It's ID'd the voltage of some LED's I pulled from old equipment. It's not a model of accuracy but works to identify components and give ball park values.
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Oh good, I just joined another Forum where every other post is going to cost me money. :laugh:
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Oh good, I just joined another Forum where every other post is going to cost me money. :laugh:
:l2:
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Has anyone used it to measure the value of a choke? And?
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Has anyone used it to measure the value of a choke? And?
yes. works - measures high though: i was expecting that since the excitation current is nowhere near the rating of the choke i measured. DCR is damn close. choke in pic is a vintage fender 90mA 4H 90DCR. p/n 022699
--pete
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5H-6H is about as expectable for a "4H" choke measured far below rated current.
I'm a little surprised it does so well.
We should never care a lot about 'exact' values of iron-core coils; as you say, they vary a lot with voltage, current, and frequency. We mainly care if a '4H' shows <1H (possibly shorted turn) or 100H (you grabbed the wrong part).
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The KOOKYE in post #2 seems to have moved to this page:
https://www.amazon.com/KOOKYE-Mega328-Transistor-Tester-Capacitance/dp/B019SXN2M2
Rated inductance range claims 20H. A few OTs, particularly hi-fi, will be higher than this.
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The KOOKYE in post #2 seems to have moved to this page:
https://www.amazon.com/KOOKYE-Mega328-Transistor-Tester-Capacitance/dp/B019SXN2M2 (https://www.amazon.com/KOOKYE-Mega328-Transistor-Tester-Capacitance/dp/B019SXN2M2)
Rated inductance range claims 20H. A few OTs, particularly hi-fi, will be higher than this.
you should give one a spin. handy little device when you want to confirm the pinning and polarity of a transistor. capacitance measurement accuracy is decent and as as you stated already - it'll help you select the right part.
--pete
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I use this unit MK-328, that comes already boxed.
Same circuit as the one shown here
I love it, one of the best additions to the workshop
(https://i.imgur.com/5uKFp9i.jpg)