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Chip Amps Amplifiers based on integrated circuits

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Old 15th February 2009, 08:55 AM   #941
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Default Here's mine (4)

The chips are mounted to the top surface of the box. The IO wiring wasn't too bad, but things were definitely getting tight by the time I finished.

I found that implementing a complete circuit with input, feedback and output filters, plus mute switches really taxes the contraption (orderly structure?) you wind up constructing. Mick Feuerbacher’s minimalist chip amps look a lot better.
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Old 15th February 2009, 08:55 AM   #942
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Default Here's mine (5)

I was surprised by the results, good sound/no noise. In such a cramped space, I was expecting noise.

The input signal grounds are connected to the ground buss bar on each chip by a single strand from an 18 ga multi-strand wire. This separates the low level signal ground from the output/power ground by about a 0.01 Ù resistance.

A braided cable from the power supply to each chip consists of 18 ga V+, 18 ga V-, and 16 ga 0V wires.

The inputs go from the jacks to the pots, then the ground and wiper lines (black & white wires) go to the chip.

By the way, the box has 1/2" wide ribs on the top and bottom surfaces. I had to cut the ribs out of the way to mount the chips. Did you know you can machine aluminum with an end-cutting router bit and a small drill press? You can't do it well, but you can do it...
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Old 17th February 2009, 02:54 PM   #943
crt is offline crt  Indonesia
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this is my little gainclone
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Old 17th February 2009, 02:57 PM   #944
crt is offline crt  Indonesia
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inside
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Old 17th February 2009, 03:02 PM   #945
crt is offline crt  Indonesia
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and the processor
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Old 17th February 2009, 05:19 PM   #946
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CRT >>> He Da Man !!

A slick and resourceful way to build from what's available. In a word: "Healthy!"

(Check out the powder coating forums, here and elsewhere, if you need to make it look more "store bought" ... but I would keep it as is.)
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Old 18th February 2009, 02:29 AM   #947
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Default Replace switch!

Hello, I just replaced the toggle switch for a DP Rocker switch.
as you can see now the light is where the toggle switch was and the DP Rocker switch is where the light was (you can not see it well because the switch is black in rectangular hole). I think it looks nicer.and also I made small "holes" on top of the volume control to mark the volume and bigger ones for the input.
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Old 18th February 2009, 02:30 AM   #948
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The volume and input selector.
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Old 27th February 2009, 04:59 AM   #949
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Here is my first try at a gainclone. I used BrianGT's PS and amp boards and sourced my own components. The chassis was from a fried Haffler amp.
My first pass and I had no hum or other unwanted noise. DC offset is 0.1 mv in both channels. Sound is excellent and there is very little noise when sitting idle and gain is turned up on the preamp. I still have a little work to do with the cosmetics.
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Old 27th February 2009, 12:46 PM   #950
troystg is offline troystg  United States
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Location: In a dream... Please don't wake me.
I don't know if you have enough heat sink...

Actually it is VERY well done. How does it sound?

Personally I would have rebuilt the Hafler.
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