Electronics > Projects, Designs, and Technical Stuff

My version of Testbench power supply

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Doctorandus_P:
It seems you're well underway to making a very capable power supply.

Total cost of all the components is probably also substancial.
Why then put an LM324 in the thing?
It is the most jelly bean opamp you can find with jelly bean specifications.

Also:
You have long traces cutting the GND plane of your PCB into pieces.
This is not desirable.
In an ideal world every trace with high frequency transients has an unbroken ground plane directly under it.

bogdant:

--- Quote from: Doctorandus_P on January 20, 2019, 05:33:14 am ---It seems you're well underway to making a very capable power supply.

Total cost of all the components is probably also substancial.
Why then put an LM324 in the thing?
It is the most jelly bean opamp you can find with jelly bean specifications.

Also:
You have long traces cutting the GND plane of your PCB into pieces.
This is not desirable.
In an ideal world every trace with high frequency transients has an unbroken ground plane directly under it.

--- End quote ---

Thanks for taking the time to look on my design. Can you recommend a better opamp? I search for a while but did not find a good reason to replaced it.
Do you think I should make a 4 layer board with 2 planes one GND and one Vin ?

bogdant:
More issue has been found since last post:
- T1 has been replaced with bc857 pnp tranzistor with emitor connected to rezistor R39 and R40
- value for R15 is to small, 1k heat up for 27V
- diferential operation should be connected with + line to most pozitive rail( reverse sign in operation schematic)
- replace R13 =100k to 5k to reduce amplification to 5
- max6070 voltage reference has been removed and vref and connected to 5V
- ground for the second channel is commun to the first channel , it will not be posible to put the channel in series
- outputs does not have the overvoltage protection
- outputs does not have on/off switch
Now the analogical part it somehow working. the voltage can be set between 0.5->27V. current limiting is working from 0->0.75A. Only tested with 35ohm load.

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