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Old 6th July 2013, 07:04 AM   #3231
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Thumbs up Correct!!!

Quote:
Originally Posted by mantha3 View Post
Make sure you have the 9240 and 240 in the right spots too...
Hi,

I do not know how, but the four mosfets were stuffed wrongly. I was asleep I suppose... The 240 were in the 9240 place....I realized before firing up one of them swapped but no the other pair that were also misplaced.

Now al LEDs lit and I am obtaining 10.30 positive and 10.10 negative.

Thank you all, best regards,

Jorge
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Old 19th August 2013, 07:04 PM   #3232
Corpius is offline Corpius  Netherlands
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Can anyone tell me what the terracotta colored isolation pads for the power MOSFET's are made of? They where supplied with the hot rod DCB1 kit. Do I need thermal paste with them?
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Old 19th August 2013, 07:51 PM   #3233
Tea-Bag is offline Tea-Bag  United States
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Those are silicon pads, no mica needed.
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Old 19th August 2013, 07:55 PM   #3234
AndrewT is offline AndrewT  Scotland
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and no thermal paste.
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Old 19th August 2013, 08:13 PM   #3235
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Better sound with Mica.
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Old 19th August 2013, 08:32 PM   #3236
Corpius is offline Corpius  Netherlands
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Quote:
Originally Posted by Tea-Bag View Post
Those are silicon pads, no mica needed.
Quote:
Originally Posted by AndrewT View Post
and no thermal paste.
Thanks!

I just powered my DCB1. All LED's lit up as supposed. Voltages are +10.24V and -10.12V
De DC offset at the output measured 1.8 mV at the right output and 0.6mV at the left output.

The power MOSFETS stay nice and cool. I'm using 10R resistors. Maybe I will increase the current to 600mA.

Yesterday I designed my own 4-ch input selection + volume control board. The PCB's are being manufactured this very moment. This will be used with the DCB1. It uses four G6K-2P small signal relays. The signals are being switched by using a ATtiny2313 with some BC338 transistors. A external 2-bit four position encoder connected to the ATtiny is used to select the desired input. It has a on-board 7812 based simplistic power supply that can be fed with both AC or DC current. The circuit that controls the relays is fully isolated from the audio signals and grounds. The potentiometer will be a blue 20K ALPS (no motor control). Hope I'll receive it soon. I will probably test the DBC1 first with just the pot in place
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Last edited by Corpius; 19th August 2013 at 08:47 PM.
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Old 20th August 2013, 07:23 PM   #3237
Neville is offline Neville  United States
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I'm looking at building another Hotrod and have quite a stash of mid to high 10mA tightly grouped jfets, so was wondering if I could use these. I was looking at using them in the 4 matched group and the 6 unmatched. I know 7mah is preferred, i dont want to go out and by more unless I have to.

Thanks
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Old 20th August 2013, 09:40 PM   #3238
Salas is online now Salas  Greece
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You can, its only they get a bit hot. If you see any suspicious dc offset wandering apply a copper foil tape linking the group of 4 tops and fold its edges up and back to the middle so it helps with dissipation.
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Old 20th August 2013, 09:46 PM   #3239
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Quote:
Originally Posted by Erlend Sæterdal View Post
Better sound with Mica.

You jest.......
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Old 20th August 2013, 09:50 PM   #3240
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No serious listening tests has proven that.
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