OK, I'll keep it between you and me (and a few hundreds other readers)
Subbu might (and I say might) design a small pcb that fit the DAC pcb DC input pins as a daughterboard. Just for a DIL14 socket, 6 component, 4 diodes and a filter cap.
Something that can be drawn in a couple of days and possibly ordered immediately in order to be shipped togheter with the mains pcbs.
BTW, I've just found an old MC1723CP in my junk bin... production code 1987!
Subbu might (and I say might) design a small pcb that fit the DAC pcb DC input pins as a daughterboard. Just for a DIL14 socket, 6 component, 4 diodes and a filter cap.
Something that can be drawn in a couple of days and possibly ordered immediately in order to be shipped togheter with the mains pcbs.
BTW, I've just found an old MC1723CP in my junk bin... production code 1987!
LM723 is the TDA1541A of regulators.... they are very good and way better than 78XX/LM317/LDOs and just look at their price. Best quality/price ratio in regs ever. Let's keep this in a small circle or prices will go up.
When you see Subbu you can tell him that I already designed a nice LM723 based power supply PCB with onboard transformer in the same format as the DAC PCB. But that again is between you and me OK ?
The 1987 MC1723CP's are double crowns ! Is it the rare gold pin variant ?
When you see Subbu you can tell him that I already designed a nice LM723 based power supply PCB with onboard transformer in the same format as the DAC PCB. But that again is between you and me OK ?
The 1987 MC1723CP's are double crowns ! Is it the rare gold pin variant ?
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LM1084 is more noisy than 7805.....it is a 5A reg which seems overkill too.
I was wrong: I meant LM1086, 1,5A LDO
... and maybe brown ceramic case? No, tin pins, std plastic case. Nice should be the round, military version. LM723H if I'm not wrong.The 1987 MC1723CP's are double crowns ! Is it the rare gold pin variant ?
Also found a couple of NOS Fairchild uA723PC made in Korea in 1985
P.S. I hate any cola
What are you having in mind? Size/priceAnybody interested in a case grop buy?
Case for the Dac of course. I will be making about 10 for me.
Come on, LM723 only needs 6 external components and the DAC only consumes 50 mA to 70 mA (when you decide on a 50 MHz Fox oscillator) so no pass transistor. Maybe just maybe when you ask Subbu in a polite manner then maybe just maybe we can make a nice LM723 based power supply PCB. Don't tell him I gave you the idea, OK ? I kind of like the "new meets old" feeling of the WM8804-ES9023-LM723 combination. No rational explanation except for the very low noise of LM723 (2.5 uV !!!).
LM1084 is more noisy than 7805.....it is a 5A reg which seems overkill too.
How to calculate Rsc?
And What is minimal input voltage with 5v out?
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I have one of the units completed for sale. It was built by JP himself. It sounds exceptional and is the equal or better of anything I have in house, cost no option. Please pm me if you would like details/photos of it.
Thank You!
Why not post some pictures here?
Regards
How to calculate Rsc?
And What is minimal input voltage with 5v out?
Hi Åke, we are still looking for other (discrete) solutions as LM723 needs at least 9.5 V input voltage. We are also willing to know how many of the group buy participants would like to have a power supply PCB too. For calculating Rsc please see data sheet of LM723.
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