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Old 9th Apr 2014, 8:48 pm   #10
G6Tanuki
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Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
Default Re: 18V mains power supplies for Hackers and similar

Have you considered using SLA batteries? I'm currently running the summer-house Roberts R707 from a 2.2AH 12V SLA and it's managed about a month of being used several hours per day and 6 or 8 hours per day at weekends with the volume turned up to 8 without needing a recharge.

Three 6V SLAs would happily give you your 18V.

SLAs have low source-impedance so are great for delivering the instantaneous current-demand of class-B output stages.

If you do go the SLA route though, I'd suggest putting a 500mA slow-blow fuse in the wiring - it might just save your output-transistors if they decide to play thermal-runaway.

Last edited by G6Tanuki; 9th Apr 2014 at 8:54 pm.
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