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Old 29th September 2014, 07:20 PM   #1
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Default ESP Project 3A

Hello Guys.

I'm new at diyAudio and I'm starting my first DIY amp.

It will be an ESP Project 3A.

So, I'm shopping around for a transformer and capacitors.

So far I have as a transformer :

HAMMOND
TRANSFORMER, TOROID, 60V, 500VA


and as a capacitor:

UNITED CHEMI-CON ESMH101VSN472MR50T CAPACITOR ALUM ELEC 4700UF 100V 20%, SNAP-IN

any other recommendations?
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Old 29th September 2014, 07:32 PM   #2
AndrewT is offline AndrewT  Scotland
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100V capacitor is wasting too much money on a voltage rating for the P3a that will run from supplies @ +-30Vdc to +-50Vdc.
Use 50V or 63V capacitors which are far cheaper.
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Old 29th September 2014, 07:36 PM   #3
PJN is offline PJN  United States
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Make sure that you know what rail voltages that amp calls for. 60vac will yield ~ 82 vdc after rectification, sounds a bit high for that amp.
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Old 29th September 2014, 07:42 PM   #4
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Hello PJN, the transformer is 2 x 30V ...
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Old 29th September 2014, 07:44 PM   #5
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Thanks for the reply.
If the diference in price is only 1 dollar less if get a 63V .. would you get the 63v or 100V?
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Old 29th September 2014, 08:11 PM   #6
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Quote:
Originally Posted by PJN View Post
Make sure that you know what rail voltages that amp calls for. 60vac will yield ~ 82 vdc after rectification, sounds a bit high for that amp.
You didn't follow the link. It is a 30-0-30vac transformer. Should be about right for that amp. It's a bit pricy though. He can get an Antek for half that.

http://www.antekinc.com/an-5430-500va-30v-transformer/
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Last edited by still4given; 29th September 2014 at 08:15 PM.
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Old 29th September 2014, 08:23 PM   #7
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Thanks guys for the quick comments.
another question :

you guys think I should have what capacitance per amplifier?
Rod recommends no more than 10000uf per amp..

I was thinking in use about 18800uf .. like 4 x 4700uf per amp.
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Old 29th September 2014, 09:13 PM   #8
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For your first amp, you could do a lot worse than listen to Rod Elliot. He has been around the block at least once.
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Old 29th September 2014, 09:28 PM   #9
PJN is offline PJN  United States
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You're right, I didn't follow the link, I stand corrected.
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Old 30th September 2014, 09:50 AM   #10
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by brunogiovs View Post
Thanks guys for the quick comments.
another question :

you guys think I should have what capacitance per amplifier?
Rod recommends no more than 10000uf per amp..

I was thinking in use about 18800uf .. like 4 x 4700uf per amp.
I recommend that a full range amplifier has it's F-3dB set to around 1Hz to 2Hz.
That requires the smoothing capacitance to be around +-20mF (20000uF) for each amplifier.

Your 4 off 4700uF, (=+-19mF per amplifier) on every supply rail fits that recommendation. That's 16 caps for a stereo amplifier. That will also give you very high ripple current capability and thus increase the life of these electrolytics.
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