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Old 27th April 2019, 07:37 PM   #791
bullittstang is offline bullittstang  United States
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Join Date: May 2013
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PeeCeeBee V4H GB
There a lot on eBay - just search “UPC1237 protection” and you will get 6-8 different versions. I have used three different designs based on the IC and all three worked perfectly.
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Old 27th April 2019, 11:36 PM   #792
Harry3 is offline Harry3  Australia
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Join Date: Mar 2005
Location: Sydney - Australia
There are advantages in using Mosfets instead of relays in speaker protection.
The thread below might interest you but the design has not been tested yet.

SSR for speaker protection?

Shaan has dual relay speaker protection on his power supply board but I would use two boards - one for each channel.

If you buy ebay speaker protection boards test them before putting them into the amp. The chip they use is being made by a third party, as the original is EOL.
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Old 28th April 2019, 12:25 AM   #793
gtose is offline gtose  United States
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Join Date: Feb 2009
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PeeCeeBee V4H GB
I’m using these mono speaker protect boards from JLesterP: Amplifier Modules and PCBs For Sale, 2pcs Blank PCB: Universal Speaker Protect Mono | eBay
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Old 7th May 2019, 06:40 PM   #794
force of 1/2 is offline force of 1/2  United States
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Join Date: Oct 2007
So, I got the amps up and running. Thanks to Shaan, LC, and everyone who contributed to this amp!

I tried them with a linear supply first: two large, screened 500VA toroids, and a simple C filter with 10000uF on each rail, +/- 42V. The amps sounded good this way, if maybe a touch cool and sterile. This might be due to the PEH200 filter Caps. The NAP-clones sounded similar with these supplies. The caps have very good specs, and a good reputation, but... hmmm...

I have the PEECEEBEE modules installed in some Naim NAP 140-style cases--so the enclosure box is the heat sink. These were left over from a previous NAP-clone build.
At 42v the 9in X 12in X .25in thick (228 x 305 x 6.35 mm) aluminum plate the amp modules are attached to was plenty heatsink enough. I could play quite loud for two hours straight and the case would feel barely warm to the touch.

Then I installed a pair of Cresnet's (MicroAudio) SMPS600 Switch Mode supplies running +/-55V. These really make the amp sing!
If you've not tried an SMPS in this amp, Cresnet's are reasonably priced and seem to work quite well.

Only problem is that at 55V (and possibly the heat contribution of the SMPS) make the amps run much hotter. After an hour of music at moderate volume, the cases are hot to the touch. I checked the Bias current, and even after the PS change they are holding steady at ~215 mV.

I guess I will have to get some real heatsinks and build new enclosures. A pity, I like the simple metal rectangle look of the Naim shoe-box style cases.

Anyone know what a safe operating temperature for the amps might be?

I don't have a good way to measure the temp, but using a candy thermometer on the case gave me a reading of 38 Celsius. A simple digital ambient air temp thermometer left on the case during use echoed the candy thermometer's reading of 38 Celsius (100 Fahrenheit)
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Old 7th May 2019, 06:46 PM   #795
force of 1/2 is offline force of 1/2  United States
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One more question: what happens if the PeeCeeBees pass signal with no load attched to the outputs? Do the MOSFETs fry? Just want to know how careful I need to be with these beasts.

Thanks!
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Old 7th May 2019, 07:39 PM   #796
Vunce is online now Vunce  United States
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Join Date: Jan 2014
Location: LI, NY
PeeCeeBee V4H GB
Quote:
Originally Posted by force of 1/2 View Post
Then I installed a pair of Cresnet's (MicroAudio) SMPS600 Switch Mode supplies running +/-55V. These really make the amp sing!
If you've not tried an SMPS in this amp, Cresnet's are reasonably priced and seem to work quite well.
I agree,
I’m using Cresnet’s SMPS1200-55 to power my V4H with
very good results also
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Old 7th May 2019, 07:49 PM   #797
force of 1/2 is offline force of 1/2  United States
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Join Date: Oct 2007
My favorite thing about the SMPS change is that the PeeCeeBees sound very good now at low volume.
I've never had an amp that could do this, exactly. At low volume they sound exactly the same as they do at full volume, only quieter. No loss in bass or detail info. I'm quite pleased.
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Old 7th May 2019, 10:58 PM   #798
abanico is offline abanico  Spain
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Join Date: Oct 2009
Default Speaker protection

I just bought
PIC-based Speaker Protection
The board is very nice made half with smd and cost 35€ with shipping .Can be powered from rails or independent supply . Protect dc, hf inestability and temperature .
Attached Images
File Type: jpg L1020277.jpg (747.9 KB, 172 views)
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Old 8th May 2019, 04:32 AM   #799
shaan is offline shaan  India
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Location: Kolkata
Quote:
Originally Posted by force of 1/2 View Post
One more question: what happens if the PeeCeeBees pass signal with no load attched to the outputs? Do the MOSFETs fry? Just want to know how careful I need to be with these beasts.

Thanks!
Hi.

As long as the signal is not severely clipping the output nothing will get hot. A clipped/oberloaded output will put the zobel resistor into danger zone.

The maximum temp for the boards depend on the capacitors' rating. If those are rated for 105C operation then it can happily run at 70C. But adequate cooling with big heatsinks are recommended for longest life.
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Old 8th May 2019, 04:33 AM   #800
shaan is offline shaan  India
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Quote:
Originally Posted by force of 1/2 View Post
My favorite thing about the SMPS change is that the PeeCeeBees sound very good now at low volume.
I've never had an amp that could do this, exactly. At low volume they sound exactly the same as they do at full volume, only quieter. No loss in bass or detail info. I'm quite pleased.
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