Products > Test Equipment
Benchtop Variable AC Power Supply Recommendation?
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ralphrmartin:
Thanks for all the further suggestions. I have an AWG, so using an LT1970a is an appealing solution as it also has adjustable current limiting. It only goes up to 0.5A, but the data sheet gives a circuit for external current boost to 5A, so it should meet my needs.

Edit: the OPA548 looks like a good bet, too. It's even possible to buy small modules with one on cheaply...
mawyatt:

--- Quote from: ralphrmartin on October 29, 2022, 03:55:33 pm ---Thanks for all the further suggestions. I have an AWG, so using an LT1970a is an appealing solution as it also has adjustable current limiting. It only goes up to 0.5A, but the data sheet gives a circuit for external current boost to 5A, so it should meet my needs.

--- End quote ---

If you need a higher voltage level the APEX PA441 or dual 443 might be considered. These utilize an external resistor across a Vbe junction to set the current limit. An LM3866 may also work, but with lower voltage capability and you'll need to configure the overcurrent utilizing the mute function. Here's link to some possibilities.

https://www.eevblog.com/forum/testgear/awg-buffer-amp/msg3368650/#msg3368650

https://www.eevblog.com/forum/testgear/hv-buffer-amp-for-awg/msg3623953/#msg3623953

https://www.eevblog.com/forum/testgear/cheap-diy-high-powervoltage-awg-buffer-amp/msg3449784/#msg3449784

Here's the APEX PA443 Dual in a AWG HV Buffer Amp config with built in +- HV supply all operates from a single +12VDC input from a few years back. Apologies for the jumpers, we didn't read the chip package layout correctly |O

If you don't want a DIY AWG Buffer , the low cost & Voltage Juntek DPA-1698 can supply 1A peak at 40VPP and uses a pair of LM1875 chips.



Anyway, hopes this helps.

Best,
ralphrmartin:
Thanks!
Swake:
For about 410€ you can buy the Matrix APS-4000A from eleshop.eu
Power    350 VA
Voltage range    0-150V, 0-300V
Maximum current    3A
Frequency range    45 - 250 Hz
https://eleshop.eu/matrix-aps-4000a-ac-power-supply.html


LinuxHata:
Kindly note, most cheap modules with "OPA548" are fakes. They have relabeled something like TDA2030 or similar :D
So I strongly suggest buying it only from digikey, mouser and other, reputable suppliers.
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