Since past month i read à lot stuffs of about GC and decided to try to build one for my office. The plaisant things with GC is de simplicity, the low number of parts and global coast but otherwise the big amount of evolution possibility. The first i will try is a NIGC based on LM375TF (I have 5 five in stocks). The trafo i will use is a 2x25V 300Va, some mur 1560 rectifier in double bridge, BG-N4.7µF and FC 1200µf for filtering.
Some 3D case views of what it could be : wood and steel mixing
PCB building, and parts soldering
Rectifier bridges
The fist evolution i will try is to add à valve (sovtek 6922) buffer.
Marc
An externally hosted image should be here but it was not working when we last tested it.
Some 3D case views of what it could be : wood and steel mixing
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
PCB building, and parts soldering
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Rectifier bridges
An externally hosted image should be here but it was not working when we last tested it.
The fist evolution i will try is to add à valve (sovtek 6922) buffer.
Marc
Here they are
On bottom side beetwin point 10-10 there is a 22k rsistor sodered and a straps beetwin point 11-11
The electrical schem is the same as BrianGT..
Marc
An externally hosted image should be here but it was not working when we last tested it.
On bottom side beetwin point 10-10 there is a 22k rsistor sodered and a straps beetwin point 11-11
An externally hosted image should be here but it was not working when we last tested it.
The electrical schem is the same as BrianGT..
Marc
The wood structure of the case with Tx installed.
A case arrangement possibility
Marc
An externally hosted image should be here but it was not working when we last tested it.
A case arrangement possibility
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Marc
Looks nice.
Be sure that you tie the input gnd and power gnd together. I run a trace between the two, which is kind of hard to see in the pictures:
Layout picture: http://www.briangt.com/order/images/gc.gif
PCB picture: http://www.brian.prohosting.com/pics/pcb1.jpg
The trace goes between R1 and R2 between the two planes.
Wishing you the best and good luck with this!
--
Brian
Be sure that you tie the input gnd and power gnd together. I run a trace between the two, which is kind of hard to see in the pictures:
Layout picture: http://www.briangt.com/order/images/gc.gif
PCB picture: http://www.brian.prohosting.com/pics/pcb1.jpg
The trace goes between R1 and R2 between the two planes.
Wishing you the best and good luck with this!
--
Brian
Nuuk said:Nice effort Idefixes! You have obviously done your homework and put a lot of thought into your design.
If it sounds as good as it looks you will have a fine amplifier!
Thanks Nuuk. A lot of my inspiration for the Valve buffer come out yours. I m waiting for two Sovtek 6922. Psu for these is based on a 80Va 2x25V tx with filtering trough BC056 1000µF/100V and 100µ/50V FC (all already in my stock) and 220R 3W resistor. For the heater i have a 10Va 2x9V and will use LM317 regulation.
Marc
cdoggy81 said:Hi Idefixes,
Can you post the schematic for the rectifier bridges as well? Thanks
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Marc
After few new topics readings, i decided to modified my pcb layout from my NIGC according to fact the fact it must be a signal ground star and a power ground star. I attemped to oversize pcb lane comparing before the old layout
The PCB has 60x35mm size
Marc
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
The PCB has 60x35mm size
Marc
Here the result. I need to drill them and to put solder on lanes
Marc
An externally hosted image should be here but it was not working when we last tested it.
Marc
My valves for the valves (Sovtek 6922) buffer
Marc
An externally hosted image should be here but it was not working when we last tested it.
Marc
Here are the Psu i planed for the valve
For the heater its based on a lm317 regulation
Marc
An externally hosted image should be here but it was not working when we last tested it.
For the heater its based on a lm317 regulation
Marc
Here are my new NIGC cards implanted.
Marc
An externally hosted image should be here but it was not working when we last tested it.
Marc
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