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Old 10th April 2006, 01:37 PM   #1
jez is offline jez  United Kingdom
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Default Hill Audio Chameleon. Has anyone got a schematic?

I have just had a Chameleon 1400S donated to me for spare parts. Having started dismantling it, I am intriuged by the bazarre
design (and what a *&^%$ to work on!), there does not appear to be enough electronics in it for it to work! There are the balanced input and bridging electronics along the rear panel then another board which appears to be the cooling fan controler and peak LED driver gubbins. The output stage appears to be bipolar and to consist of 4 pairs of devices in each channel (have not dismantled this enough to read part numbers etc).....but where is the amplifier itself!?
The only thing I can think of is that it uses a topology similar to texas instruments "The Texan" from the early '70s in which an op-amp drives an output stage that has voltage gain, in which case the input board could be doubling up as the amp proper.
Whilst taking it to bits I found that one of the smoothing caps was leaking badly (burst can!), this was not visible until this stage of dismantling, and is probably the main/only fault in the beast (see where this is going
I am thinking of getting the thing up and running ( ) but I can find no info on this amp anywhere (other than spec....looks good). To cut to the chase, is there anyone on the site who has a circuit diagram and would be willing to share it? I see that Pinkmouse mentioned a possible schematic many moons ago but the thread seemed to die out. Any chance here Pinkmouse?
Thanks in advance,
Jez.
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Old 23rd May 2010, 06:15 PM   #2
spatch is offline spatch  United Kingdom
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Try this Chameleon 1400S stereo power amplifier. Free data sheet by GB Audio
I have a friend that uses this amp for testing loudspeakers great amp if you get it up and running
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Old 24th May 2010, 07:39 AM   #3
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i have the scheamatic ...if you need it just e mail me ... but please can i have some close ups from the amlifier so we know that we talk about the same thing ???

the schamtic i have is costum made so it will need to be veryfied


regards sakis
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Old 24th May 2010, 10:23 AM   #4
jez is offline jez  United Kingdom
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Quote:
Originally Posted by sakis View Post
i have the scheamatic ...if you need it just e mail me ... but please can i have some close ups from the amlifier so we know that we talk about the same thing ???

the schamtic i have is costum made so it will need to be veryfied


regards sakis
Hi Sakis,
If you cast your mind back a couple of years you will recall that in the end I stripped the chassis and reverse engineered it. I obtained the schematic in this way and sent it to you before then putting it up on this site. We had extensive discussions by PM about it at the time......
The schematic I obtained by this method worked fine in simulation.
There is no point in me taking any photos of it now because it's just a box of bits in it's present form! There's some decent output devices from it that I will no doubt use at some point though.
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Old 22nd November 2010, 06:47 AM   #5
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Hi all!

I have a 2200s model which has the same schematics as 1400s just more output devices. Mine has a problem with fan control block. It has been repaired by someone before and does not work properly. The op-amp marked IC7 in the schematics from gb audio in my case does have no number/name on it. I suspect it was replaced and I wonder what was the original part. If some of you still has this device or has a part list can you please advise the part no. It is a 5-pin (at least in my case) op-amp above the fan terminal. Of course this part can be unavailable now but basing on the part no I would be able to determine it's parameters and choose a proper replacement.

Many thanks in advance,
Alexey.
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