The MONGREL (supersym II)

[ostripper]

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

[bobodioulasso]

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.

[repeet]

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.

[Krisfr]

Originally Posted by ostripper

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?

[ostripper]

Originally Posted by repeet

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

[Krisfr]

Mouser does not list euro-connect

Sorry, do you have another name or part.

Thanks

[sng001]

Originally Posted by repeet

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

[sng001]

Originally Posted by Krisfr

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

[repeet]

Ah-ha! Looks like I have Q7 upside down compared to your photos.
Pete.

[ostripper]

Originally Posted by repeet

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