Electronics > Projects, Designs, and Technical Stuff

Modern day 723 and 78xx for new design

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schmitt trigger:

--- Quote from: imo on January 25, 2019, 07:46:47 pm ---This is a 723 switcher from a car charger (cigarette lighter adapter 14V->5V).

--- End quote ---

WOW. A Harris semiconductor CA723. Nice vintage find.
Of course, a metal can uA723 would be an even better vintage part.

Wolfgang:
The oldest ones I have are Harris military chips in CERDIP from 1986.

Photo here:

https://electronicprojectsforfun.wordpress.com/2018/09/18/not-all-lm723s-are-born-equal/

Hiemal:
I got one!

http://ww1.microchip.com/downloads/en/DeviceDoc/mic5156.pdf

These are quite pricey, but they have the advantage of being able to use N-channel mosfets. The 5158 version even has a built in charge pump to ensure proper gate drive, something that I feel is pretty unique.

coromonadalix:
Here is a very nice and well done project by velleman
The K7200 kit  0-30v 0-10 amps power supply

The 723 can make good psu's, it's still in production

https://www.velleman.eu/downloads/0/manual_k7200.pdf

tkamiya:
I think I'm going to use LM317.  Load regulation 0.05% and ripple is 0.5%.  That's about 1.n mV at 24V.  Not bad for simple circuit.  7824 on the other hand is order of magnitude worse.

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