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Old 14th September 2009, 08:22 PM   #1221
pchw is offline pchw  United States
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Before you fire up the amp, make sure you have a fuse in the primary.
Also, a variac or a light bulb currently limiter jig is highly recommended.

1. You don't need a load at the output.
2. I measured the B+, B-, voltage across the 3W 0.47R, and DC offset.

Have fun!!
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Old 24th September 2009, 10:22 AM   #1222
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When i turn on my aleph mini i get an offset of approximately 300mV on my speaker out wich drops in about 4-5 seconds to 30mV. Is this normal and do I need to do something to protect my speakers?
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Old 27th September 2009, 05:30 AM   #1223
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hi all
are these boards still availiable

im after 4x output boards to turn my mini a aleph 5 into a 4

mine are the original brian gt mini a boards

regards sheafer
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Old 27th September 2009, 05:31 AM   #1224
udailey is offline udailey  United States
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Just go buy them at Chipamp.com
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purchase LDRs anytime Also try my Resistor Replacers or LDR based Input Selector Email me. diyldr@gmail.com
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Old 27th September 2009, 05:41 AM   #1225
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thanks mate

i just found them and sent brian some paypal

regards sheafer
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Old 18th October 2009, 05:36 PM   #1226
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Quote:
Originally Posted by pchw View Post
Before you fire up the amp, make sure you have a fuse in the primary.
Also, a variac or a light bulb currently limiter jig is highly recommended.

1. You don't need a load at the output.
2. I measured the B+, B-, voltage across the 3W 0.47R, and DC offset.

Have fun!!
Just tested today, both amps seem Ok.
I've measured 5mV at the output (DC Offset).
Forgotten the voltage for the 0.47R... I'll measure tomorrow.
Is it correct ?
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Old 18th October 2009, 05:47 PM   #1227
Beftus is offline Beftus  Netherlands
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A 5mV DC offset is very low. Great to hear you've fired up the mini Aleph Korben69!

The voltage across the 0.47R and Ohms Law give the bias current your mini Aleph is running at. I = V / 0.47, in a normal mini Aleph V is about 0,5 volts resulting in a bias current of ~ 1 ampere.

When my transformer arrives I'm also gonna wire everthing together and fire up mine. I'll keep you posted.
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Old 18th October 2009, 05:52 PM   #1228
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Thanks for your kind words Beftus !
I'll give some news tomorrow about the 0.47R voltage.
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Old 18th October 2009, 09:00 PM   #1229
pchw is offline pchw  United States
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5mV is excellent. I think mine is at 25mV, and I don't bother to go lower. I would rather spend the time on listening :-) FWIW, my bias measures 0.47V across a 0.47 // a 1R, that will be around 1.47A.
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Old 19th October 2009, 08:26 AM   #1230
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I've got 0.450 v at the 0.47R, less than 1A.
For DC offset I've tried with another DMM, the value is about 30mV decreasing.
Now I've to connect in real life and listen... keep you informed
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