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Old 4th August 2019, 10:51 AM   #11631
HatlessChimp is offline HatlessChimp
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AX14.
Ok my big output transistors mounted. I'm going to relocate Q10 with wire to the heatsink via a 3 pin pcb quick clip connector. And I have some funny looking heatsinks for the MJE 340/350s.

Does anyone have a photo/schematic of the voltages I should roughly see, please.

I will have 35vdc rails from my 25vac secondarys.

Should I have thiel circuit on the outputs?

Thanks lads for all the help. Almost there now!

20190804_202048.jpg20190804_202026.jpg20190804_203223.jpg
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Old 4th August 2019, 05:15 PM   #11632
prasi is offline prasi  India
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Quote:
Originally Posted by still4given View Post
Sorry, I don't know what happened there. Here is a corrected file.
Hello Terry,
Could you also attach the spice file and models used.
So people can work out voltages depending upon their supply voltage levels. It will indeed be very helpful to debug every build on their own.


regards
Prasi
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Old 5th August 2019, 03:51 AM   #11633
ChrisMmm is offline ChrisMmm  New Zealand
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Quote:
Originally Posted by HatlessChimp View Post
AX14.
Ok my big output transistors mounted.
You will be using some mica or silicon insulators on the transistors connected to the heatsink right?
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Old 5th August 2019, 05:17 AM   #11634
ChrisMmm is offline ChrisMmm  New Zealand
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OK, so just theoretically how much damage are you likely to do if you reversed the polarities on the power supply leads to the AX14 board?

Yes, testing my 2nd board I connected the + and - incorrectly, well the marking for the + on the board had gotten a bit hard to see and looked like a - and I rushed things a bit.

Onboard fuses blew straight away then the 2.2uf caps exploded before I could shut the power off. They are before the fuses so not protected.

Obviously fuses and caps need replacing but do you think I likely did any other damage? Everything looks OK, probably try powering up carefully once I replace fuses n caps.
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Old 5th August 2019, 05:26 AM   #11635
prasi is offline prasi  India
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be very careful.
You may have damaged everything. I would discard it and build a new one.

However if you just want to confirm, Use a mains bulb tester to powerup and be at a safe distance. If the bulb lights up brightly, it means the devices are damaged.
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Old 5th August 2019, 05:28 AM   #11636
still4given is offline still4given  United States
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Quote:
Originally Posted by prasi View Post
Hello Terry,
Could you also attach the spice file and models used.
So people can work out voltages depending upon their supply voltage levels. It will indeed be very helpful to debug every build on their own.


regards
Prasi
Hopefully this will help.
Attached Files
File Type: asc AX14 4-output.asc (12.2 KB, 18 views)
File Type: txt Cordell Models.txt (19.6 KB, 18 views)
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Old 5th August 2019, 05:36 AM   #11637
still4given is offline still4given  United States
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Quote:
Originally Posted by HatlessChimp View Post
AX14.
Ok my big output transistors mounted. I'm going to relocate Q10 with wire to the heatsink via a 3 pin pcb quick clip connector. And I have some funny looking heatsinks for the MJE 340/350s.

Does anyone have a photo/schematic of the voltages I should roughly see, please.

I will have 35vdc rails from my 25vac secondarys.

Should I have thiel circuit on the outputs?

Thanks lads for all the help. Almost there now!

Attachment 772555Attachment 772556Attachment 772557
This is with35V rails.
Attached Files
File Type: pdf AX14 4-output.pdf (66.5 KB, 88 views)
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Old 5th August 2019, 06:03 AM   #11638
still4given is offline still4given  United States
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Quote:
Originally Posted by ChrisMmm View Post
OK, so just theoretically how much damage are you likely to do if you reversed the polarities on the power supply leads to the AX14 board?

Yes, testing my 2nd board I connected the + and - incorrectly, well the marking for the + on the board had gotten a bit hard to see and looked like a - and I rushed things a bit.

Onboard fuses blew straight away then the 2.2uf caps exploded before I could shut the power off. They are before the fuses so not protected.

Obviously fuses and caps need replacing but do you think I likely did any other damage? Everything looks OK, probably try powering up carefully once I replace fuses n caps.
If the fuses blew quickly, D5 and D5 may have saved you. You may have to replace them though. It's worth trying it out with a light bulb tester in series with the AC input.
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Old 5th August 2019, 06:24 AM   #11639
ChrisMmm is offline ChrisMmm  New Zealand
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Quote:
Originally Posted by prasi View Post
be very careful.
You may have damaged everything. I would discard it and build a new one.

However if you just want to confirm, Use a mains bulb tester to powerup and be at a safe distance. If the bulb lights up brightly, it means the devices are damaged.
Thanks. I googled light bulb tester and what I saw was simply a mains bulb in series with the AC, is that all?

Thinking new build of the blown board will be best, I would never trust the damaged one and I really don't want to blow my expensive speaker drivers.

Darn, was so pleased the first channel came up first time. Should have taken more time over it. Still, of the many amps I have built over the years this is the first failure.
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Old 5th August 2019, 06:35 AM   #11640
anoopkrajan is offline anoopkrajan  India
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Hi all,
In FH9, T3, ie, MPSA92 running rather hot is it normal ? Does it need a heat sink ? Amp is running fine.
Thanks and regards.
Anoop.
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