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Amp Camp Amp Kit V1.6
Amp Camp Amp Kit V1.6
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Old 14th October 2018, 07:11 AM   #271
Mooly is offline Mooly  United Kingdom
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Amp Camp Amp Kit V1.6
Nothing that can't be fixed easily and cheaply

The FET's can be removed by snipping the leads (if you aren't familiar with de-soldering practices and have the necessary stuff). You can then heat and remove each 'stump' with pliers and finally clean the hole with a bit of stainless wire and heat. Solder won't stick to stainless. Or use solder braid.

I can't say for sure if the FET's will be OK... although I suspect they will be. The critical thing would be whether the Vgs parameter has been exceeded and if so then by how much in relation to the FET's spec. Power FET's like the IRFP240 are typically -/+20 volts and you have up to 24 volts available.

Without the FET's fitted you should actually end up with close to zero volts at the amplifiers mid point. Its a bit hard to visualise what would happen in your set up with reversed FET's

For what a set of new FET's would cost it might be wise to replace them.

All easily fixable though.
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Old 14th October 2018, 12:43 PM   #272
gstengel is offline gstengel
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I went ahead and ordered new FETs, just to be sure. I can desolder with no trouble I think. I'm still sort of shaking my head in disbelief. Being my first build I was trying to be really careful. I'm very colorblind so I even had a friend help with the resistors, just to make sure I didn't confuse any. I just didn't notice the orientation on the IRFP240s. Live and learn I guess.
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Old Yesterday, 09:17 PM   #273
systemerror909 is offline systemerror909  United States
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Wanted to type up a follow up post to the one I did a while back. I was able to sort out my issues with the DacMagic, the grounding loop issues were being introduced my Dell desktop machine via the USB connection. Fortunately I had an old USB toslink card lying around, so I switched to optical input and Viola! All my ground loop issues were solved, and I can play 96khz 24bit Tidal masters quality music to boot!

Listening with the ACA has been quite an enjoyment, definitely better than any other amp I've owned. As my first class A amp, I've also been pleased to discover this thing is perfect for warming my hands as the seasonal change turns weather colder. Yet, it also doesn't draw so much electric that I worry about leaving it on. What a sweet spot this amp occupies!!

One modification I'm tempted to add is a volume control. Realistically, I'll probably never use the thing as a monoblock, I'm thinking I might just replace the monoblock switch on the back with a potentiometer of suitable fit/size/quality. Any recommendations?
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Old Yesterday, 09:34 PM   #274
RichieBittner is offline RichieBittner
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Join Date: Mar 2018
Quote:
Originally Posted by gstengel View Post
Just finished my 1.6 build, first ever amp build for me, new to it all. Everything seemed fine, checked and rechecked and power up seemed fine, no blue smoke and two lit led's. When I went to set the bias however my meter shows 24V at Q1 center and pot adjustment does nothing. This is the same on both boards. I'm getting ready to start checking resistances and voltages but I was hoping someone here might know what my problem might be? At least, you know, my problem with this build.
Check to see the the big transistors are in right side up.
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Old Yesterday, 09:40 PM   #275
RichieBittner is offline RichieBittner
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I did it too and they were fine when flipped.
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Old Today, 03:21 AM   #276
ThermalAlchemy is offline ThermalAlchemy  United States
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Join Date: Jan 2017
Location: San Francisco
Default Color blind choosing resistors with numbers not colored stripe

Quote:
Originally Posted by gstengel View Post
I went ahead and ordered new FETs, just to be sure. I can desolder with no trouble I think. I'm still sort of shaking my head in disbelief. Being my first build I was trying to be really careful. I'm very colorblind so I even had a friend help with the resistors, just to make sure I didn't confuse any. I just didn't notice the orientation on the IRFP240s. Live and learn I guess.
Color blind choosing resistors with numbers not colored stripe
I to make many mistakes trying to decipher the colorcode bands on resistors so I found a line resistor that print the actual number right on the side of the resister without color itís so much easier. Vishay resistors print the Ohm reading right on top of the resister playing in sight easy to read. Ever since I found these resistors use on other projects it was an easy sale I never want to use colored bands again just give me resistors with printed numbers and values on them
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