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Old 15th August 2005, 03:39 PM   #21
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Quote:
Originally posted by dome406
Here is a picture of the underside, what should I use to clean all the flux and stuff off it because you cant get rubbing alcohol in this country. Is meths ok or is it too oily.
If it's a rosin core flux, don't worry about it. It's not conductive. Unless of course you just want it to look pretty.

In future, you might consider getting a solder with a water soluable organic flux such as Kester with their "331" flux. Then you can just rinse it off under the tap with some warm water and a toothbrush (be sure to do both sides of the board).

se
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Old 15th August 2005, 05:03 PM   #22
Vikash is offline Vikash  United Kingdom
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Quote:
Originally posted by dome406
Here is a picture of the underside, what should I use to clean all the flux and stuff off it because you cant get rubbing alcohol in this country. Is meths ok or is it too oily.

http://img227.imageshack.us/img227/9276/dscf07960lj.jpg

Thanks
Perhaps this:
http://www.maplin.co.uk/Module.aspx?...27521&doy=15m8
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Old 16th August 2005, 10:13 PM   #23
dome406 is offline dome406  United Kingdom
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Is it ok to use a 2.2k 3watt wire wound resistor whcih I have lying around for the LED on the power suppy board R3 on the Audiosector design and R5 on the Rev3 board of Brian GT.

'Edit
Also does the SG on the amplifier board go to the outer part of the phono of the input and similarly the OG to the negative speaker terminal. and the the CHG to the Ground, does this need a resistor and capacitor in paralell? '

Thanks Very Much,
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Old 16th August 2005, 10:21 PM   #24
homer09 is offline homer09  Canada
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Quote:
Originally posted by dome406
Is it ok to use a 2.2k 3watt wire wound resistor whcih I have lying around for the LED on the power suppy board R3 on the Audiosector design and R5 on the Rev3 board of Brian GT.

Thanks

as long as 2.2k provides the voltage drop you need for your LED, yes it is more than ok. of course 3w is overkill, but since its lying around, go for it (if it fits)
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Old 16th August 2005, 10:32 PM   #25
Vikash is offline Vikash  United Kingdom
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Quote:
Originally posted by dome406

Also does the SG on the amplifier board go to the outer part of the phono of the input and similarly the OG to the negative speaker terminal. and the the CHG to the Ground, does this need a resistor and capacitor in paralell? '
SG -> phono shield
OG -> loudspeaker ground
CHG -> chassis ground. i just use a ~10ohm resistor.
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Old 16th August 2005, 11:00 PM   #26
dome406 is offline dome406  United Kingdom
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I dont really know much about calculations for but I do know the ratings of the LED.

It requires 3.2v a maximum of 4v, 30ma of current
Below a link to the datasheet if you need more info.
http://www.farnell.com/datasheets/57709.pdf

I am powering the rectifiers with 18v 220va transformers per channel.

Thanks for the help.
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Old 16th August 2005, 11:10 PM   #27
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I'm using 62k resistor with a small red Panasonic LED. It's better to start with bigger resistor first and see how it works. Besides, I don't want my LEDs to be too bright. The wattage is 0.25W
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Old 16th August 2005, 11:18 PM   #28
Vikash is offline Vikash  United Kingdom
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Take a look here to understanding precisely how to calculate the resistor value: http://myweb.tiscali.co.uk/nuukspot/...ncloneFAQ.html
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Old 16th August 2005, 11:36 PM   #29
dome406 is offline dome406  United Kingdom
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Thanks, I should look a bit more thoroughly before posting next time .
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Old 10th April 2008, 10:39 PM   #30
bsmif is offline bsmif  United States
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Default Voltage at my speaker terminals?

Just wired up my first gainclone (one of Peter's 3875 kits). For some reason the negative voltage is coming off the positive connections of the powersupply board and vice versa. It was hooked p this way briefly before I turned it off, tested the leads and switched them. (seemed easier than flipping the diodes or trying to figure out what I did wrong on the PSU. SO Now one channel works fine while the other has -27 volts at the speaker terminals. Also has -1.2V at the input. Any idea what I did wrong? What I am likely to have blown out by having the wrong voltage hooked up briefly?
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