Electronics > Projects, Designs, and Technical Stuff

Simple DIY Linear PSU

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panoss:

--- Quote from: xavier60 on March 07, 2020, 04:51:24 am ---The design on  mike_mike's thread uses a BD244a. Check what the modeled current gain is.

--- End quote ---
I don't have the simulation file of mike_mike's design.
I 'm expecting someone to send it to me.

xavier60:

--- Quote from: panoss on March 07, 2020, 07:48:57 am ---
--- Quote from: xavier60 on March 07, 2020, 04:51:24 am ---The design on  mike_mike's thread uses a BD244a. Check what the modeled current gain is.

--- End quote ---
I don't have the simulation file of mike_mike's design.
I 'm expecting someone to send it to me.

--- End quote ---
You mainly need to find a driver transistor with reasonable gain. What did you use in the simulation of LM723 design?
Keep in mind to regularly check Q1's Base voltage.
The .pdf you posted seems corrupted.

panoss:

--- Quote from: xavier60 on March 07, 2020, 07:56:56 am ---
--- Quote from: panoss on March 07, 2020, 07:48:57 am ---
--- Quote from: xavier60 on March 07, 2020, 04:51:24 am ---The design on  mike_mike's thread uses a BD244a. Check what the modeled current gain is.

--- End quote ---
I don't have the simulation file of mike_mike's design.
I 'm expecting someone to send it to me.

--- End quote ---
You mainly need to find a driver transistor with reasonable gain. What did you use in the simulation of LM723 design?
Keep in mind to regularly check Q1's Base voltage.
The .pdf you posted seems corrupted.

--- End quote ---


Ok, I imported the D45H11 's model from a PSpice model for this transistor. (it 's doable)
We do have an improvement but it's far from proper working:
RL=10 Ohm, 1.42A, 14.2V
RL=5 Ohm, 11.5V,  2.31A

I reuploaded both .zip and .pdf files.

xavier60:
Did you note Q1's Base voltage? Can you obtain Q1's Collector current from the simulation?

panoss:
RL=10 Ohm, Q1 Vb= 7.12V   Ic=0A
RL=5   Ohm, Q1 Vb= 7.60V   Ic=0A

No current through Q1??  :-//

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