| Products > Test Equipment |
| Looking for a 20A, 500W AC power supply |
| << < (4/5) > >> |
| j_omega:
As far as I can tell, something like this should work? https://www.ebay.com/itm/165019291586 It uses the TPA3255 amp for TI |
| aagw:
I have used EP4000 from Behringer with great success when testing some track circuit relays, which must have 95/105Hz. https://www.behringer.com/product.html?modelCode=P0A37 Lots of power :) |
| Martin72:
What the "Audio Solution" concerns, we (at work) got three of them. One is a testsetup for resonance circuits, checking and adjusting coils. Got a Sinewavegenerator, a 1400W PA-Amplifier and a Pre-Resistor on the output to make sure, the amp won´t be damaged if the coil is getting saturated. Second is a setup for checking inverters, same as before but with transformer for galvanic isolation on the output and no pre-resistor. The third is somekind of special... ;) It uses three "High-End" PA-Amplifiers with 2.5KW each, driven by a 3-Phase sine with free adjustable frequency, delivers up to 135Vrms/phase on 4 Khz... I have some doubts about using a really cheap Class D amp for this purposes, but I can´t put it in the right words actually. ;) Must think about it. |
| j_omega:
--- Quote from: Martin72 on July 15, 2022, 09:31:06 pm ---What the "Audio Solution" concerns, we (at work) got three of them. One is a testsetup for resonance circuits, checking and adjusting coils. Got a Sinewavegenerator, a 1400W PA-Amplifier and a Pre-Resistor on the output to make sure, the amp won´t be damaged if the coil is getting saturated. Second is a setup for checking inverters, same as before but with transformer for galvanic isolation on the output and no pre-resistor. The third is somekind of special... ;) It uses three "High-End" PA-Amplifiers with 2.5KW each, driven by a 3-Phase sine with free adjustable frequency, delivers up to 135Vrms/phase on 4 Khz... I have some doubts about using a really cheap Class D amp for this purposes, but I can´t put it in the right words actually. ;) Must think about it. --- End quote --- I did some more looking at the pro-audio market and found some nice offerings from Crown, QSC, Yamaha, and Behringer. For this purpose, does the class of amplifier matter (AB vs D)? I can find some name-brand high-power AB amps on eBay for great prices. |
| Martin72:
For the third solution, we got the amplifiers from crown, because we must make sure the power will be constantly avaible. In this case it must be top quality. We use this setup for tests who last more than three days nonstop under full power... For the other we use indeed "cheap" Class AB Power Amplifiers from "Monacor" or newer IMG stageline. |
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