<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">It's not a reliable feature, just a side effect of whatever values your particular unit has. People complain about it all the time. For example:<div class=""><br class=""></div><div class=""><a href="https://www.harmonycentral.com/forums/topic/1591085-boss-pedals-way-to-defeat-auto-on-when-turning-power-on/" class="">https://www.harmonycentral.com/forums/topic/1591085-boss-pedals-way-to-defeat-auto-on-when-turning-power-on/</a></div><div class=""><br class=""></div><div class="">OP in this thread has two Boss pedals that power up to On and two that power up to Off.</div><div class=""><br class=""></div><div class="">There is plenty of stuff online about how to modify the flip-flop circuit to ensure it does come up in one state or the other though, if you want to modify it. Basically, you need to introduce some inequality that's bigger than the "naturally occurring" inequalities found due to component tolerances.</div><div class=""><br class=""></div><div class="">HTH,</div><div class="">Tom</div><div class=""><br class=""><div class="">
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<div><br class=""><blockquote type="cite" class=""><div class="">On 31 Jan 2024, at 15:43, Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca" class="">jpdesroc@oricom.ca</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Hi list,</div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class="">I have a question about the behaviour of transistor type flip-flop circuit<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class="">When the DC power is applied to it..<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class="">The following schematic of Boss CE-2 pedal shows the flip-flop at the bottom right.<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class="">Why when the DC power is applied : collector of Q6 goes high (to make the pedal in the ‘no effect’)<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class="">And it’s not Q7 that goes this way instead ?<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class="">I know that C23 (.01uf) pull down the trigger input when DC is applied<br class="">to put the pedal in the ‘no effect’ position, but why is Q6 selected ?<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class="">This is a ‘balanced’ flip flop circuit and both sides should behaves the same<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class="">But some kind of selection is done here.<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="" class="">Could someone explain that behaviour ?<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span id="cid:image001.jpg@01DA5432.4483D780"><image001.jpg></span><span style="" class=""><o:p class=""></o:p></span></div></div><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; 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