I have been trying to persuade the Group Buyers to adopt a single PCB for both the -ve and +ve regulated supplies.
With care, any of the existing PCBs can be converted to the other polarity.
I would rather buy all the PCBs identically and use the build manual to guide me to achieving which polarity I require.
But even that complication is not always required.
Simply build all -ve regulators and use a dual secondary to power the regs. This gives an equal or better performance Dual polarity regulated supply than having to buy specialised +ve & -ve PCBs and having the problem of "left overs".
With care, any of the existing PCBs can be converted to the other polarity.
I would rather buy all the PCBs identically and use the build manual to guide me to achieving which polarity I require.
But even that complication is not always required.
Simply build all -ve regulators and use a dual secondary to power the regs. This gives an equal or better performance Dual polarity regulated supply than having to buy specialised +ve & -ve PCBs and having the problem of "left overs".
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What's confusing about having one PCB and one set of instructions for building one polarity of regulator?
I cannot see that getting any simpler.
Now attach a pair of these simple to assemble regulators in series for a dual polarity supply. The only condition is that dual AC to DC supplies must also be provided. This is done with a dual secondary transformer and each secondary has it's own Bridge Rectifier. Again very simple instructions. Build either the single polarity (no options nor different PCBs) or build the dual polarity using the dual polarity diagram.
Anything that adds options/choices and needs further explanation is what makes the process more complicated.
I cannot see that getting any simpler.
Now attach a pair of these simple to assemble regulators in series for a dual polarity supply. The only condition is that dual AC to DC supplies must also be provided. This is done with a dual secondary transformer and each secondary has it's own Bridge Rectifier. Again very simple instructions. Build either the single polarity (no options nor different PCBs) or build the dual polarity using the dual polarity diagram.
Anything that adds options/choices and needs further explanation is what makes the process more complicated.
would a pic of the converted reg do as a taster?
It was the second PCB I assembled to prove to myself that the "conversion" was doable.
Don't know what makes all follow best, do post pic or further explanations for anybody to study, you are always welcome.
The 4th led is there to help widen set resistor choice if needing high bias. If for below 200mA, its better you jumper the 4th led. If for more, determine from 9610 Vgs at target current by watching the curve that I had included in the revised guide. All leds Vf together - Vgs is voltage across set resistor. If red are doing it better for resistors collection in hand, use red.
I finally found a 2x25V toroid to use as testing transformer for my 30V pos/neg SSLV regulator. Using 220R dummies (all 4 wires connected) all LED's light up,
CCS current is at 150mA ( +side 8.2R and -side 6.8R resistors), but I have fixed voltage at about 32V out? I then tried smaller dummies but same result.
Salas, can you shed some light on my situation?
Thank you.
PS. Voltage reference is populated with 2 red LED's, 6.8k and 5k trimmer.
CCS current is at 150mA ( +side 8.2R and -side 6.8R resistors), but I have fixed voltage at about 32V out? I then tried smaller dummies but same result.
Salas, can you shed some light on my situation?
Thank you.
PS. Voltage reference is populated with 2 red LED's, 6.8k and 5k trimmer.
Does not have to do with dummies. Simply if you had chanced on strong IDSS Vref fets, could 6.8k pushed to the raw DC minus CCS Mosfet's Vgs upper limit. Parallel another 6.8k to an already soldered 6.8k carefully using crock clips, to see if it will give you range. If nothing changes we will look for other explanation. But use 470R dummies anyway. You are near your CCS limit power for 220R at about 30V.