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Looking for a little power amp project (spoilt for choice on here)
Looking for a little power amp project (spoilt for choice on here)
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Old 19th September 2018, 12:43 PM   #31
xrk971 is online now xrk971  United States
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Looking for a little power amp project (spoilt for choice on here)
The USSA-5 is a highly regarded amp and on my to-build list. I have all the parts in fact, but I am not sure it’s appropriate project for the OP who said this is his first step up from a TPA3116 class D amp. I would say it’s an amp for a seasoned builder with at least a couple of discrete Class A or AB amps under his/her belt. The power supply is much more than SMPS brick and a cap Mx, then there are the parts costs (the actives alone run circa $175 IIRC), and there is setup adjustment to zero offset and set bias. This is where the Alpha is a bit better. Same PSU and chassis requirement but inexpensive easy to find actives and no setup adjustments.
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Old 19th September 2018, 12:51 PM   #32
mbrennwa is offline mbrennwa  Switzerland
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Originally Posted by Hikari1 View Post
Your desires for small chassis and class a mean low wattage and low bias. Class a is all about bias and heat dissapation. Go with a bigger chassis.
Or with class AB amp that operates in class A most of the time. This saves a lot of the heat/size issue. The Honey Badger is great.
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Old 19th September 2018, 01:37 PM   #33
Puggie is online now Puggie  United Kingdom
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To be fair, I'm new to scratch building amps, but I do build satellites from build manuals and spent 7 years teching in a studio repairing quad 405s, studer tape machines and endlessly recapping a large neve mixing desk. So I'm not a noob from the build/assembly point of view, just new to the plethora of amp designs available. Neither am I particularly knowledgeable about amp design which is why I want to start with a simple class a, half the point of this is to get a better understanding of discrete electronics, the nice amp at the end is a well engineered byproduct!

I've dug out a heatsink, 350mm long 95mm tall (once I've faced the cut edge off) with 50mm long combined fins and base. I hope to cut this into two to make a stereo (ACA) amp.
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Old 19th September 2018, 02:13 PM   #34
e_fortier is offline e_fortier  Canada
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Looking for a little power amp project (spoilt for choice on here)
Originally Posted by acg View Post
USSA-5 is circa 25w Class A. Not sure if it would fit in your chassis though...it might. There is a GB on here for the amp and for the power supplies.

Also, help from Fab if you have any questions along the way is simply amazing!
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