<div style="color:black;font: 10pt Arial, Helvetica, sans-serif;">My dad made one for a school play when I was in HS that I've used dozens of times. Simple hand crank to generate voltage to trigger the ringer. Old Ma Bell phone circa 1960 on the other end.
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<div>Last time I used it was for a performance of Bugsy Malone I directed when I was still teaching. When I called for the cue, nothing happened. Called again - still nothing. ASM told me "He's turning the handle, but the wire's broken off!" I slid open the booth window from the back of the house and loudly yelled "Brrrrrring! Brrrrrring!" Audience laughed, 8th grade actor took his cue and the show went on.</div>
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<div>God I miss those times... </div>
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<div>Kristi R-C<br>
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<div style="font-family:helvetica,arial;font-size:10pt;color:black">-----Original Message-----<br>
From: Jerry Durand via Stagecraft <stagecraft@theatrical.net><br>
To: Stagecraft <stagecraft@theatrical.net><br>
Cc: Jerry Durand <jdurand@durandinterstellar.com><br>
Sent: Sat, Apr 11, 2020 1:03 am<br>
Subject: Re: [SML] Telephone line simulator<br>
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<div>For the low of budget people, if you just need to generate ring you can do so with bits you might have laying around.<br clear="none"><br clear="none"></div>
<div>You'll need:<br clear="none"></div>
<div>An audio source for 20Hz sine wave, pulsed in whatever cadence you want.<br clear="none"><br clear="none"></div>
<div>An audio amplifier, I used a Radio Shack PA amplifier for one setup. Doesn't need to be quality, just function.<br clear="none"><br clear="none"></div>
<div>If the amplifier has 70 volt line out, you can skip the transformer in the next line.<br clear="none"><br clear="none"></div>
<div>An 8 ohm to 70 volt PA transformer.<br clear="none"><br clear="none"></div>
<div>A blocking capacitor, steal a RUN capacitor from an induction motor you're not using.<br clear="none"><br clear="none"></div>
<div>The capacitor isn't strictly needed, but does limit current.<br clear="none"><br clear="none"></div>
<div>Circuit is audio source > amplifier > 8-transformer-70 > capacitor in series with one lead > telephone.<br clear="none"><br clear="none"></div>
<div>Be sure and cut the audio when the actor picks up, you don't want to blast his ear with the ring signal. Maybe remove the speaker from the phone.<br clear="none"><br clear="none"></div>
<div>Experiment to find what works well with your phone and gear.<br clear="none"><br clear="none"><br clear="none"><br clear="none"></div>
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<div>---<br clear="none"></div>
<div>Jerry Durand, Durand Interstellar, Inc. +1 408 356-3886<br clear="none"></div>
<div><a rel="noopener noreferrer" shape="rect" target="_blank" href="http://www.durandinterstellar.com/"></a><a rel="noopener noreferrer" shape="rect" target="_blank" href="http://www.durandinterstellar.com/">www.DurandInterstellar.com</a> & <a rel="noopener noreferrer" shape="rect" target="_blank" href="http://www.durandinterstellar.ru/"></a><a rel="noopener noreferrer" shape="rect" target="_blank" href="http://www.durandinterstellar.ru/">www.DurandInterstellar.ru</a></div>
<div class="yiv8356368861gmail_quote"><blockquote class="yiv8356368861gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex;"><pre class="yiv8356368861blue"><br clear="none"></pre></blockquote></div>
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