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<p>The LM331 (still in production) may also be a consideration,
although it is limited to 100kHz max.</p>
<p>Ian Fritz's DoubleDeka VCO is an example:</p>
<p><a class="moz-txt-link-freetext" href="http://ijfritz.byethost4.com/DD_web.pdf">http://ijfritz.byethost4.com/DD_web.pdf</a></p>
<p>- Oren<br>
</p>
<div class="moz-cite-prefix">On 2/7/23 12:55 PM, rrsounds via
Synth-diy wrote:<br>
</div>
<blockquote type="cite"
cite="mid:BDAD9521-7CED-4463-89F7-A1490F5BA5D5@aol.com">
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Generally speaking, BBD devices have a limited number of
“buckets." The faster you cycle through them, the shorter the
delay. 500kHz is going to result in a pretty short delay. On the
positive side, the S/N is also related to cycling rate, resulting
in a much cleaner result at higher rates.
<div class="">Are BBDs even still produced?</div>
<div class="">David Reaves<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Feb 7, 2023, at 19:18:08PM, Rutger Vlek via
Synth-diy <<a href="mailto:synth-diy@synth-diy.org"
class="moz-txt-link-freetext" moz-do-not-send="true">synth-diy@synth-diy.org</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class=""><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; text-indent:
0px; text-transform: none; white-space: normal;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
text-decoration: none; float: none; display: inline
!important;" class="">Dear list,</span>
<div 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; text-indent:
0px; text-transform: none; white-space: normal;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
text-decoration: none;" class=""><br class="">
</div>
<div 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; text-indent:
0px; text-transform: none; white-space: normal;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
text-decoration: none;" class="">For a while I've been
working on a guitar pedal board for personal use. I'm
about to build the second revision of a solid state
pre-amp, and was thinking about possible modulation
effects too. I would love a nice (stereo) BBD
flanger/chorus, but felt a bit fed-up with all the
'classic' designs, particularly the traditional clocking
scheme, usually with a limited range, lack of current
drive (to overcome capacitance of the BBD clock input)
and strictly linear modulation (calling for a
hyper-triangle modulation source).</div>
<div 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; text-indent:
0px; text-transform: none; white-space: normal;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
text-decoration: none;" class=""><br class="">
</div>
<div 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; text-indent:
0px; text-transform: none; white-space: normal;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
text-decoration: none;" class="">Having some experience
with designing saw- and tri-core VCO's around the 2164,
I was wondering how easy it would be to push the design
of a typical tri-core VCO with an 2164-based expo
converter into higher frequencies (let's say up to
500kHz) and use it to clock a BBD? Has anyone tried? Or
are there fundamental reasons why such frequencies are
not possible? I've never (intentionally) worked with
circuits outside of the audio bandwidth...</div>
<div 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; text-indent:
0px; text-transform: none; white-space: normal;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
text-decoration: none;" class=""><br class="">
</div>
<div 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; text-indent:
0px; text-transform: none; white-space: normal;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
text-decoration: none;" class="">Rutger</div>
</div>
</blockquote>
</div>
<br class="">
</div>
<br>
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