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Old 29th November 2010, 01:50 PM   #851
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Default Another pix...

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I also can plug my GX's back in to get voltage readings. Or , my simulation of it is within 1% of the real values.
BTW , I am going to give the GX a "facelift" , it's a good amp.

OS
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Old 29th November 2010, 02:04 PM   #852
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Hi OS,
Will these boards ( at least input boards) be available or do we have to make our own PCBs?
I am very interested in making an Cx and Gx.
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Old 29th November 2010, 04:15 PM   #853
repeet is online now repeet  Australia
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Thanks guys, I'll check over again tomorrow. All the LED's light up but will double check all components as you have suggested. Whatever the error is, I have done it on both boards.
Pete.
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Old 29th November 2010, 07:51 PM   #854
Krisfr is offline Krisfr  United States
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Quote:
Originally Posted by ostripper View Post
Click the image to open in full size.
I also can plug my GX's back in to get voltage readings. Or , my simulation of it is within 1% of the real values.
BTW , I am going to give the GX a "facelift" , it's a good amp.

OS
Hey OS

Where do you get those pretty blue power connects and pots? EBAY?
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Old 29th November 2010, 11:01 PM   #855
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Thanks guys, I'll check over again tomorrow. All the LED's light up but will double check all components as you have suggested. Whatever the error is, I have done it on both boards.
Pete.
If both green leds light up your cascode works , make sure you did not do as me and confirm that you have NFB from the output to the nfb terminal. I still have the original layout/ overview of the GX (below) , even as I will soon give it a "facelift".

Krisfr , all my trimpots and euro-connects are from mouser , I buy whatever is the best deal , some are blue/green/black.
OS
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Old 29th November 2010, 11:27 PM   #856
Krisfr is offline Krisfr  United States
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Mouser does not list euro-connect

Sorry, do you have another name or part.

Thanks
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Old 30th November 2010, 12:05 AM   #857
sng001 is offline sng001  Australia
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Quote:
Originally Posted by repeet View Post
Thanks guys, I'll check over again tomorrow. All the LED's light up but will double check all components as you have suggested. Whatever the error is, I have done it on both boards.
Pete.
Hi Pete,

Don't forget the links. I also made a stupid mistake when I tried to adjust the CCS current - I adjusted the wrong trimpot; The CCS trimpot is the second one from the left.

Good luck with your trouble-shooting.

Cheers, Stanley
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Old 30th November 2010, 12:29 AM   #858
sng001 is offline sng001  Australia
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Quote:
Originally Posted by Krisfr View Post
Mouser does not list euro-connect

Sorry, do you have another name or part.

Thanks
Hi,

I looked up the Mouser paper catalog, I found at least two parts:

538-39880-0302 Molex Eurostyle Terminal Blocks
571-2828372 Tyco Fixed Terminal Blocks 5.08MM PCB MOUNT 2P

Phoenix Contact also work but you have to select the correct mounting pitch & mounting style.

Cheers, Stanley
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Old 30th November 2010, 02:32 AM   #859
repeet is online now repeet  Australia
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Ah-ha! Looks like I have Q7 upside down compared to your photos.
Pete.
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Old 30th November 2010, 02:47 AM   #860
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Ah-ha! Looks like I have Q7 upside down compared to your photos.
Pete.
I did that too , but did not power the circuit up. replace that tranny .. it might be toast. If your trimmers are new they should be centered (200r will be at 100r - in the middle) , this is almost perfect for CCS adj. . the offset adj is not as critical and will not cook your amp , but make sure your Vbias for the output stage is set at its max (200r). This will underbias the output stage until you adjust for 12-15 mv across the big .22R emitter resitors (50-80mA per device) .
OS
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