<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Ring mods usually sound better with a bit of high roll-off anyway!<div class="">Great results can be had from just four germanium diodes and two transformers… and a lot of post-gain.<br class=""><div><blockquote type="cite" class=""><div class="">On 17 Jan 2016, at 9:41 am, Paul Perry <<a href="mailto:pfperry@melbpc.org.au" class="">pfperry@melbpc.org.au</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font face="Arial" size="2" class="">Any small (or large) mains power transformer is optimised for 50or 60Hz, so there is no problem going low.</font></div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font face="Arial" size="2" class="">The high end might be lacking, though... so you need to experiment, maybe with some high end boost either before or after.</font></div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font face="Arial" size="2" class=""></font> </div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font face="Arial" size="2" class="">paul perry Melbourne Australia</font></div><blockquote style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); padding-right: 0px; padding-left: 5px; margin-left: 5px; border-left-color: rgb(0, 0, 0); border-left-width: 2px; border-left-style: solid; margin-right: 0px;" class="" type="cite"><div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;" class="">----- Original Message -----<span class="Apple-converted-space"> </span></div><div style="background-color: rgb(228, 228, 228); font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;" class="">i'm currently trying to figure out how to get reasonably affordable transformers for a passive ring modulator.<br class=""><br class="">i'm finding that terminology like "audio transformer" does not necessarily correspond to a 20hz to 20khz frequency response - and that those types of transformers seem quite rare & expensive. i realize low frequency is a perpetual problem in the x-former world, but it would be nice to find something that reliably reached a low of 100hz.<br class=""><br class="">i was wondering if people had any go-to sources for the kind of solution i'm looking for.<br class=""><br class="">thanks,<br class="">yAP yAP<br class=""></div><div class=""><font face="Arial" size="2" class=""></font><br class="webkit-block-placeholder"></div></blockquote><span style="font-family: Helvetica; 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