A number of charge pumps/voltage doublers are on the market. Brands I've heard mentioned include: Godlyke ISO-Pump/Charge Pump [same thing?] Disaster Area DVC-18 xotic Voltage Doubler Cioks Charge Pump TGP Member Sonic VI [contact?] Logsdon Audio Max 1044 Madbean? Any feedback per which are: * Safest for pedals/power supplies * Quietest * Flexible in terms of voltage increase * Current capacity (some only offer 80 ma) Thanks for your help!