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Old 6th September 2007, 04:06 PM   #61
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That is the job of R12. I don't think the diode will add much.

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Old 6th September 2007, 04:50 PM   #62
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Hello

So that diode won't do much but won't do worse ?

Btw, did you do any update to that project since ?

Thank m. Pass

Gaetan
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Old 20th November 2007, 05:35 AM   #63
posxia is offline posxia  China
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My dear DIY brothers:

I did citation 12 mos fet last week too,the sound quite good .each channel is handed with 2 IRFP240, but till now there are two
problems troubling me.

Firstly, when the voltage is large (eg: V=+-45V I=100mA), the IRFP240 is very easy destroyed.

Secondly, when the current is large (eg: V=+-35V I=1A), the IRFP240 is very easy destroyed too.

But it can work very good when the voltage is +-35V and the current is 100mA.

I had noticed the turn-on thump of C12, but is this the reason who destroyed the IRFP240?

Who can give me a favor about the explanation of this case.

Thank a lot!
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Old 21st November 2007, 01:42 AM   #64
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The voltage isn't too high for the devices, but perhaps your
bias is running high, and possibly you are seeing oscillation.

Can you monitor the bias currents?

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Old 8th January 2013, 06:29 PM   #65
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FHigh Quality IRFP240 Push Pull Audio Power Amplifier Kit Based on Citation 12 | eBayriends,
I bought a plate amp citaion 12 on Ebay, the seller is not sure about it. I wonder if the transistor Q4 should be glued to the heatsink for thermal control? The scheme at the end of this page

Already many thanks for the information
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Old 10th January 2013, 04:23 AM   #66
Junm is offline Junm  Philippines
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I also made this amp before and still working right now...before q4 was on the board, it works but easily damage the mosfets ,so i pulled them up and screwed on the main heatsink and avoided the problem... this serves as thermal track transistor..
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Old 10th January 2013, 10:10 AM   #67
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Very good Junm, grateful for the advice! It is a BC546B. I'll turn it heat to the heatsink and try your sound. What did you think of the sound? It is well detailed? Congratulations .....
.
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Old 14th January 2013, 08:50 AM   #68
Junm is offline Junm  Philippines
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Quote:
Originally Posted by camargo View Post
Very good Junm, grateful for the advice! It is a BC546B. I'll turn it heat to the heatsink and try your sound. What did you think of the sound? It is well detailed? Congratulations .....
.
I used different transistors and power mosfets from hitachi...for me, sound is nice and has brilliant HF.
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Old 14th January 2013, 09:53 AM   #69
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I made the connection heatsink, the circuit seems to be very stable. Did coupling audio with tantalum capacitors (10uf x 35v). The equipamantos MARANTZ NAD and have many of these capacitors in the signal line (audio), I confess, it was wonderful, if you want to try ....
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Old 14th March 2013, 07:16 PM   #70
nrg2009 is offline nrg2009  United States
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Would you mind posting a photo of the completed amp? I always worry buying a board of eBay, there may be mistakes in the board..
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