Spencerleehorton
Well-known member
HI Guys,
thought i would document my build of this unit as the balancing board option doesn't seem to have been documented.
I have built a G1176 with adjustable psu and a balancing board and it works nice.
I have a 24vac toroidal which will feed both the +30v/-10v and the +18v/-18v psu (+30v/-10v for the main pcb and +18v/-18v for the balancing board)
The balancing board is from the the GSSL 9k preamp and you can either use SSM2142 or DRV134. i've used the SSM2142 but will also put in the DRV134 to compare.
I have left out the following off the main pcb as im using adjustable psu:
CR6, CR7, CR8, CR9, CR10, C24, C25, C26, R85, R86, 7824 regulator.
I put 2 jumpers in to connect from where the diodes were to get the +30/-10v into the main pcb.
Looking at the component side the 2 diodes to the left are the the + side and the two diodes to the right are the negative side, so connect the 2 diodes to the left to the bottom connection of where the 7824 would have gone.
The 2 diodes to the left need to connect to left hand R85 side, that gets the power in.
Everything else is fairly straight forward, check all resistors before you put in, saves a lot of mucking around after!! and also make sure you get all components the right way round, worth taking your time to save time later.
For all the off board connections i suggest putting wire or header pins in so you solder to the pins rather than the pcb, as you can over heat these pcbs if your not careful and also if you make a few mistakes with connections this helps.
It states the only gnd connection to the chassis from the main pcb is on the input XLR and you can also connect the mains power ground from the IEC power connector to this point and I have XLR Pins 1 connected together In a star ground config.
I have also used OPA2604 instead of 5532, as it says these are direct replacements and I have loads.
regards
Spence.
thought i would document my build of this unit as the balancing board option doesn't seem to have been documented.
I have built a G1176 with adjustable psu and a balancing board and it works nice.
I have a 24vac toroidal which will feed both the +30v/-10v and the +18v/-18v psu (+30v/-10v for the main pcb and +18v/-18v for the balancing board)
The balancing board is from the the GSSL 9k preamp and you can either use SSM2142 or DRV134. i've used the SSM2142 but will also put in the DRV134 to compare.
I have left out the following off the main pcb as im using adjustable psu:
CR6, CR7, CR8, CR9, CR10, C24, C25, C26, R85, R86, 7824 regulator.
I put 2 jumpers in to connect from where the diodes were to get the +30/-10v into the main pcb.
Looking at the component side the 2 diodes to the left are the the + side and the two diodes to the right are the negative side, so connect the 2 diodes to the left to the bottom connection of where the 7824 would have gone.
The 2 diodes to the left need to connect to left hand R85 side, that gets the power in.
Everything else is fairly straight forward, check all resistors before you put in, saves a lot of mucking around after!! and also make sure you get all components the right way round, worth taking your time to save time later.
For all the off board connections i suggest putting wire or header pins in so you solder to the pins rather than the pcb, as you can over heat these pcbs if your not careful and also if you make a few mistakes with connections this helps.
It states the only gnd connection to the chassis from the main pcb is on the input XLR and you can also connect the mains power ground from the IEC power connector to this point and I have XLR Pins 1 connected together In a star ground config.
I have also used OPA2604 instead of 5532, as it says these are direct replacements and I have loads.
regards
Spence.