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diyAB Amp  The "Honey Badger" build thread
diyAB Amp  The "Honey Badger" build thread
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Old 13th June 2019, 10:23 PM   #3561
AudioSan is offline AudioSan  Norway
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i would go for a dual mono if you'r chassis allows it. Mine don't. i need too fit 5ch inn to one chassis.
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Old 18th June 2019, 12:28 PM   #3562
MikeylikesI is offline MikeylikesI
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Hi, I'm new here. I have purchased the parts and boards for this amp. I was wondering if I would have a problem remote mounting the power transistors. In my chassis the heat sinks are in the middle and I don't think I can fit the boards on the heat sinks. I was thinking 18 Gage and heat shrink the Leeds on the transistors.
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Old 18th June 2019, 02:52 PM   #3563
AudioSan is offline AudioSan  Norway
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If you can't fit the boards on the heatsinks, than the heatsinks are too smal.
Unless it's fan cooling.
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Old 18th June 2019, 05:04 PM   #3564
MikeylikesI is offline MikeylikesI
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Quote:
Originally Posted by AudioSan View Post
If you can't fit the boards on the heatsinks, than the heatsinks are too smal.
Unless it's fan cooling.
I'll take care of that. Are there issues with connecting the power transistors with 3-4 inch Leeds?
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Old 25th June 2019, 03:02 PM   #3565
akimmet is offline akimmet  United States
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Originally Posted by MikeylikesI View Post
I'll take care of that. Are there issues with connecting the power transistors with 3-4 inch Leeds?
Yes, having the output transistors on leads like that significantly increases the risk of oscillation. Moving the output transistor base resistors from the board to the end of the lead can sometimes help if this is what you need to do.
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Old 30th June 2019, 02:41 AM   #3566
stuartmp is offline stuartmp  Australia
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Matching transistors from my mate Chris and his HB build. Attachment 76570620190630_123943.jpg
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Old 30th June 2019, 04:52 PM   #3567
anatech is offline anatech  Canada
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diyAB Amp  The "Honey Badger" build thread
Hi Stuart,
What are you measuring on the meters? Can we see the test setup?

-Chris
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Old 1st July 2019, 07:10 AM   #3568
stuartmp is offline stuartmp  Australia
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Hi Chris. Just using my transistor matcher. Not sure why the other image did not upload.
The meter on the left is measuring the VE (voltage at the emitter) the other meter is measuring the IE current through the emitter. Just need to times the meter reading by 10 as im using a 10ohm sense resistor. So 10mv corresponds to 1mA. 20190630_123948.jpg

Last edited by stuartmp; 1st July 2019 at 07:14 AM.
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Old 1st July 2019, 07:54 AM   #3569
HatlessChimp is offline HatlessChimp
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Originally Posted by stuartmp View Post
Hi Chris. Just using my transistor matcher. Not sure why the other image did not upload.
The meter on the left is measuring the VE (voltage at the emitter) the other meter is measuring the IE current through the emitter. Just need to times the meter reading by 10 as im using a 10ohm sense resistor. So 10mv corresponds to 1mA. Attachment 765877
Nice work you're a legend! Thx
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Old 1st July 2019, 03:59 PM   #3570
anatech is offline anatech  Canada
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diyAB Amp  The "Honey Badger" build thread
Hi Stuart,
Although your matching device looks very complicated (there is a lot going on there), it doesn't appear to run a pair at the exact same temperature. So it would be a good pre-sort for the final match jig that would be based on a long tailed pair with those transistors mounted together (touching) and isolated from outside air and air currents.

Can you share any additional information on your matching jig?

-Chris
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