Calsbro pm 10 wedge monitor amp

[Rsluke]

Hi does anyone have a circuit of the calsbro pm10 wedge monitor speaker amp please or perhaps a url to take me to a site that has one.
Rog

[Jazz P Bass]

Not too sure what the issue is.

No sound may be a faulty output IC # TDA7293.

[Rsluke]

You may well be right. I prefer working with a diagram though, old habits die hard. It was no output and I found three dry joints , two on wire would resistors and one on q choke, I was convinced that it was going to work. It didn't but these dry joints may well have damaged the chip. I've ordere one anyway but would still like a circuit diagram. Thanks for your in put.
Rog

[Jazz P Bass]

Give this video a look.

https://www.google.com/url?sa=t&rct=...49397726,d.amc

[J M Fahey]

Thanks JPB

Interesting introduction for those who are just starting, also gives a clue about why those TDA chipamps die, even inside a powered monitor so no cable shorts or misconnections (the usual SS amp killers) are possible: itīs being used with hairy +/- 52V rails, while datasheet absolute maximum is +/-50 and even that must NOT be reachd (thatīs what absolute means) .
LM3886 has a (well deserved) reputation for longevity, while essentially the same TDA729x are reputed ticking time bombs.
Difference is that LM3886 are used with +/-35V rails *tops* , and often with +/-28V , while TDA729x are often used with +/-45V or *higher* ... yet both have exact same case, exact same "heat transmission capabilities" if you wish, both are the same as two TO220 cases side by side,so there is only so much heat they can issipate, period.

I use TDA7294 with +/-38 or 40V rails and have no problems at all.
I much prefer real 80W RMS all day long than iffy "100W" ... as intended in this monitor and many others.
Marshall is famous for murdering these chips, but even respected Fishman uses them in one of their "Loudbox" acoustic amps ... and those also die

[Rsluke]

Thanks I have seen this, alas no help.

[Rsluke]

Thanks for this, I think I may have said earlier that I found some dry joints in this amp which are on power components. This may have caused chip to die. I tend only to have a Cerys quick look at these things until I have a circuit diagram.

[Rsluke]

Thanks, reply is below

[Rsluke]

All fixed now, suspect that the dry joint on the of caused the chip to die, would still like the circuit diagram tho.