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Old 26th March 2013, 11:15 PM   #151
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Right, back home and stripped off the heatsink again and replaced the IRFP250 and 2 x 18NB40 Mosfets.

Still no joy. On Power Up, both green LED's light as normal for 1 sec, dim for 1 sec then starts a quick on-off cycle [roughly 2 pulses per second]?

Starting to feel like this build is jinxed

Paul
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Last edited by BuildMeSomething; 26th March 2013 at 11:44 PM.
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Old 26th March 2013, 11:44 PM   #152
NicMac is offline NicMac  Italy
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Quote:
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jinxed
meaning
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Old 26th March 2013, 11:45 PM   #153
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cursed
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Old 27th March 2013, 10:45 AM   #154
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Yes, meaning cursed...

Nearly reached the point whereby I switch to Plan B.
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Old 27th March 2013, 11:13 AM   #155
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have you spoken to Roberto about returning the unit to base for repair?
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Old 27th March 2013, 11:32 AM   #156
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No, not yet... Was hoping I could get it done here.

TBH, no real need for a 100W+ Power Amp, I made the wrong choice and should have gone for The Wire LPUHP.

Plan B is; The Wire PSU @ +/-25VDC > Input, & unregulated +/- 25VDC > output.
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Old 27th March 2013, 05:09 PM   #157
qusp is offline qusp  Australia
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well to be fair, the LPUHP sold out in 24hrs...

you could bias this amp hard for full class A at 40-50W the DPS600 will handle that, just start up with low bias 50-100ma or so and then crank it up to 800ma-1A

Last edited by qusp; 27th March 2013 at 05:11 PM.
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Old 27th March 2013, 11:08 PM   #158
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Yep, I saw the LPUHP thread not long after it was first posted, however at the time was of the mind set that more power was required...

Am still considering switching to a higher bias after start-up, it's just making the switch fool proof enough. Plus integrating some thermal protection for the higher temps.

Could possibly utilise a Raspberry Pi running a basic start-up program, allowing switching to/from standby and set Low/High bias via momentary switches or from a GUI.

It was me not correcting the bias while testing, that blew this unit in the first place. Fingers crossed that it can be made to work again
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Old 28th March 2013, 02:17 AM   #159
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Thanks for the heads up about making sure I check the bias before starting while I test it, I'm getting closer to testing mine in the next few weeks. Ideas cooking for bias switching So, don't focus too much on solving that problem for now.

I'm with qusp sending the DPS600 back to Roberto for repair is looking like an good option at the moment.
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Old 19th November 2013, 08:55 AM   #160
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Hi guys,

as the DPS600 is noticed anywhere, where "The Wire" can be found, I asked myself, where it could be bought, as AudioPower only has the 400-/ 500-series. Is it still not in a final status?
Another information I couldn't find is the AUX-voltage, which should be higher for my (LME-) usage than the output voltage..

Many thanks,

Stammheim
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