My first gainclone

mirmite · 5th February 2013, 10:36 AM

Hi, have ordered this kit from ebay, anyoe that have som bad experiense with it?
http://item.mobileweb.ebay.com/viewi...d=260912360644
Or Any advice on changes i need to make?, Or mods, would be Nice with a volume knob

JMFahey · 5th February 2013, 11:48 AM

Changes/Mods?
Wait until you build it first

If anything, worry about good grounding and layout.
As of a volume pot, just stick one between input jacks and PCB input pins.
2x50K Log/Audio is fine.
If hard to find, 100K does work properly and is usually stocked by more suppliers, although the "big ones" such as Mouser or Digikey have lots of stuff.

bcmbob · 6th February 2013, 11:39 AM

mirmite,

There is a full thread on that design here on the forum. Should answer all your questions.

mirmite · 6th February 2013, 03:19 PM

great thanks ! have been reading up now, great link

Stereo Speaker Protection DIY Kit Components | eBay thinking of getting this kit aswell

mirmite · 21st February 2013, 05:49 PM

So here is a some uppdates, the gainclone is up and runing, get a littel hum when there is no audio playing, but gives a good sound, waiting for my speaker protection system

schematic for the wiering and gnd https://dl.dropbox.com/u/15996745/bajs2/au/its.png

gootee · 22nd February 2013, 03:15 AM

You can probably eliminate the hum if you simply tightly twist together each pair of wires, with about 4 turns per inch. Do an especially good job for each pair of transformer wires, ALL the way to both ends of each pair, for both primary and secondary pairs. And also do an especuially good job for the input signal/ground pairs. Make sure the two wires in each pair ALWAYS and everywhere stay right together, and are twisted tightly.

Also, try to keep all of the low-level sinal and ground stuff as far away as possible from the AC stuff and from the outputs. If they do have to get close, keep them orthogonal to each other, and never parallel.

Oh, and input signal AND GROUND should NOT connect to the chassis at the jack. The jacks should be insulated from the chassis. The input signal ground should only connect on the PCB.

mirmite · 22nd February 2013, 04:18 AM

Oh i Will trist the vanors and tie them today,
And the input gnd is only connected to the pcb and the volume knob

5th February 2013, 10:36 AM	#1
mirmite diyAudio Member Join Date: Aug 2012	My first gainclone Hi, have ordered this kit from ebay, anyoe that have som bad experiense with it? http://item.mobileweb.ebay.com/viewi...d=260912360644 Or Any advice on changes i need to make?, Or mods, would be Nice with a volume knob

6th February 2013, 11:39 AM	#3
bcmbob diyAudio Member Join Date: Dec 2009 Location: Bay City, Michigan	mirmite, There is a full thread on that design here on the forum. Should answer all your questions. __________________ Bob M. "Arrange Whatever Pieces Come Your Way."

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5th February 2013, 11:48 AM	#2
JMFahey diyAudio Member Join Date: Mar 2009 Location: Buenos Aires - Argentina	Changes/Mods? Wait until you build it first If anything, worry about good grounding and layout. As of a volume pot, just stick one between input jacks and PCB input pins. 2x50K Log/Audio is fine. If hard to find, 100K does work properly and is usually stocked by more suppliers, although the "big ones" such as Mouser or Digikey have lots of stuff.

6th February 2013, 03:19 PM	#4
mirmite diyAudio Member Join Date: Aug 2012	great thanks ! have been reading up now, great link Stereo Speaker Protection DIY Kit Components \| eBay thinking of getting this kit aswell

21st February 2013, 05:49 PM	#5
mirmite diyAudio Member Join Date: Aug 2012	So here is a some uppdates, the gainclone is up and runing, get a littel hum when there is no audio playing, but gives a good sound, waiting for my speaker protection system schematic for the wiering and gnd https://dl.dropbox.com/u/15996745/bajs2/au/its.png

22nd February 2013, 03:15 AM	#6
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	You can probably eliminate the hum if you simply tightly twist together each pair of wires, with about 4 turns per inch. Do an especially good job for each pair of transformer wires, ALL the way to both ends of each pair, for both primary and secondary pairs. And also do an especuially good job for the input signal/ground pairs. Make sure the two wires in each pair ALWAYS and everywhere stay right together, and are twisted tightly. Also, try to keep all of the low-level sinal and ground stuff as far away as possible from the AC stuff and from the outputs. If they do have to get close, keep them orthogonal to each other, and never parallel. Oh, and input signal AND GROUND should NOT connect to the chassis at the jack. The jacks should be insulated from the chassis. The input signal ground should only connect on the PCB.

22nd February 2013, 04:18 AM	#7
mirmite diyAudio Member Join Date: Aug 2012	Oh i Will trist the vanors and tie them today, And the input gnd is only connected to the pcb and the volume knob