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Old 30th May 2003, 12:02 PM   #21
elizard is offline elizard  Canada
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how do i measure em???
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Old 30th May 2003, 03:24 PM   #22
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good advice from everyone else. keep at it is my advice. when i first made my gainclone, i tried being to smart and changing the circuit, and surpise surpise, it didnt work but i followed the circuit diagram (peter daniel) and it worked first time.
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Old 30th May 2003, 07:05 PM   #23
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Quote:
Originally posted by elizard
how do i measure em???
Put an ohm meter on them (+ to + and - to - of course) and watch the meter. As the cap charges, the resistance should climb- quick at first, and then slow down and almost settle. If you get constant high ohms, or really low ohms, it is probably dead. Unless they are BG or something, I would go ahead and replace them if for nothing more than the peace of mind. Hang in there. You'll get it!
Steve
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Old 30th May 2003, 07:52 PM   #24
elizard is offline elizard  Canada
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do i need any sort of a load?
or can i just hook them up to the outputs of the bridges w/o anything on the end?
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Old 30th May 2003, 09:05 PM   #25
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you need to unhook one of the bridge leads, or you will be measuring through two diode junctions. You don't want a load connected when you do this. Make sure it is powered down!
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Old 30th May 2003, 10:07 PM   #26
Rarkov is offline Rarkov  England
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Quote:
Originally posted by Gerontius
I had the power transformer in it's own case connected by an umbilical and a Neutrik connector.

...

When I went to fire it up for the second or third time, I mistakenly connected the mains neutrik connector into the amp/eq chassis where the umbilical from the transformer chassis should have gone. 230V AC where 35V DC should have gone. It made a terrible squelching noise, and the result was that almost every chip in the case was fried instantly. It didn't smell too good either.
That is EXACTLY the reason we have standard connectors so things like this never happen! Plz be careful - it will kill - or at least give you a bad hair day!
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Old 31st May 2003, 12:28 AM   #27
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Quote:
Originally posted by Rarkov


That is EXACTLY the reason we have standard connectors ...
This idea was crystalized in my mind in that moment I plugged it in. I realized the guy that invented the concept of uniquely shaped connectors was a genius. I'd of invented them at that moment if they weren't already.
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Old 31st May 2003, 01:28 PM   #28
moe29 is offline moe29  United States
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i don't know if it's just me, but a Gain Clone seems like a tough
first project. Point to point wiring in small places... it sounds like
(smells like?) he probably had a short somewhere, polarity
reversed, etc... easy to do in in such cramped quarters.

my first DIY attempt was so laughable i won't even mention it
here! You're in good company elizard!!

good luck elizard, keep at it.
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Old 31st May 2003, 05:15 PM   #29
Nuuk is offline Nuuk  United Kingdom
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Quote:
i don't know if it's just me, but a Gain Clone seems like a tough
I disagree. If you have ever tried to troubleshoot a fault on a discrete amp, you'll know that the GC is comparatively easy! With so few parts, you could substitute all of them (if necessary) in an hour or two at the most.

I think it is because the Gainclone looks so easy, that some people 'throw' it together and then get problems. I do agree that point-to-point wiring in such a confined space does require extra skill. Maybe first-time builders would do better to start with a purchased PCB (the GC equivalent of buying a kit amp).

Also, because the GC looks so easy and attracts many newbies to the DIY hi-fi club, perhaps those of us with more experience should try and anticipate some of the problems/mistakes they may encounter. When I have time, I will try and include a few more of the 'basics' on my Gainclone page.
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Old 31st May 2003, 05:41 PM   #30
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Blowing stuff up is a good kind of fault to troubleshoot- just follow
your nose.

I built a preamp early on and the two channels didn't sound the same

it's still sitting on the shelf 25yrs later....
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