General > General Technical Chat
Show your favorite and most used benchtop PSU
MarkF:
I have been hooked on these little supplies since my college days.
Currently, I have three of them and a fourth 60V model.
Mr Evil:
--- Quote from: BravoV on December 28, 2019, 04:13:28 pm ---Congratz on your 1st post, and welcome to the forum. :clap:
--- End quote ---
Thanks. I don't know why I didn't join this place years ago.
artag:
I have a few of these Lambda supplies in various ranges. They're quite small, at least in panel space : 4 will fit in a 19" rack frame. Amazingly, the first two I bought were from a normal car boot sale (not an amateur radio one .. just the usual clothes and attic junk, and these lovely power supplies).
I wish I could get some more coaxial knobs to fit them, though - most have that cover over the output voltage control (right hand supply) instead. Preferably to match the current limit control, I'm fussy like that.
A tip if you have one of these to repair and need to replace the Lambda-marked 'special' regulator IC. It's a Motorola MC1566L.
Although I also have some HP and Farnell supplies with higher ratings or better precision, I use this one more than anything : it deals with the majority of needs and, most important of all, it has no fan.
I do have a couple of home-made ones as well (built while I was at high school). They still work but don't have meters though so are less convenient to use.
Wolfgang:
Hi,
my first (1978) was a homebrew linear PSU 2-30V, 1.5A using a standard LM723 circuit with current limiter and analog meter. Big heatsink, no fan, selfmade PCB.
Now, my default PSU is the Rigol DP832A (2x30V/3A, 1x5V5A). Same as Dave.
For super sensitive stuff (ULN crystal oscillators) I use Keysight SMUs (B2962A).
High voltage PSUs I made from scratch (e.g., 250V/150mA, 500V/30mA, ...)
https://electronicprojectsforfun.wordpress.com/power-supplies/high-voltage-lab-power-supplies/
For my other projects, I normally prefer homemade standard PSUs using either LM723 or TL431 regulators.
I dont like the LM78XX and LM317 series parts too much because of more noise and many counterfeit parts.
jogri:
My most used PSUs are those two linear Oltronix B703DT. A joy to work with, but a PITA to disassemble since there is virtually no space left unused on the inside (Marco Reps did a video on his unit if you want pictures of the inside, i am not going to open mine [btw, you can tear them down rather easily, but he somehow didn't figure out how]). The PSU on the top is still waiting for its upgrade to safety banana plugs, i am kind of hesitant to open it again.
They are relatively compact (roughly 20x20x20 cm) and feature three galvanically isolated channels each, so you can stack the outputs together to get a 100V 0.6A supply.
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