<DIV>Thanks Scott, I think I'll go with that idea, they can be vc'd too. </DIV>
<DIV> Know where I can get that in an ASCII schematic??</DIV>
<DIV> </DIV>
<DIV>Thanks again for your help.</DIV>
<DIV> Steve<BR><BR><B><I>Scott Gravenhorst <music.maker@gte.net></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">"john mahoney" <JMAHONEY@GATE.NET>wrote:<BR>>> ...but only square waves<BR>><BR>>If I recall correctly, Scott Gravenhorst has used a PLL to generate saws =<BR>>from squares. Would that be useful?<BR><BR>Actually, this came from the beloved "Adolph Amin" AKA Bjorn Julin/Nillson.<BR>I have a simplified schematic at:<BR><BR>http://home1.gte.net/res0658s/electronics/4046PLL_saw_out.gif<BR><BR>It's a dual input high impedance amplifier connected to each side of the<BR>VCO cap. The outputs are summed and voila, out comes a sawtooth.<BR><BR>I never got around to actually trying the waveshaper because I couldn't get<BR>the VCO to behave linear enough for use in music. But the principal of<BR>operation is not complex and there is no reason for it not to work.<BR><BR>IMHO, the 4069 VCO is the best bet, and if you eliminate the PWM part, you<BR>can make 2 VCOs from one ch!
ip
package.<BR><BR><BR>>He's also worked on some kind of divider for creating different =<BR>>intervals from a master (high speed) oscillator.<BR>><BR>>The above is from memory, perhaps Scott can add some details.<BR>>--<BR>>john<BR>><BR>><BR>> ----- Original Message -----=20<BR>> From: Steve Allen=20<BR>><BR>><BR>><BR>> Hello All,<BR>> I'm looking to build a module that will be used to generate a drone =<BR>>tone to under current the main theme in a musical pieace. I've looked at =<BR>>using 555 timer to CD4024 divider, a dozen of those would be cool, but =<BR>>not very flexable once tuned up.<BR>> How about CD4046 PLL's using the divider scheme, more flexable, but =<BR>>only square waves. Hum....... A bank of Rene's CMOS VCO's ........ a =<BR>>little complex but very useful.<BR>> Any ideas? Hope I'm not being too vague or.... well, never mind. Any =<BR>>and all ideas will be appreciated.<BR>><BR>>
Thanks,<BR>> Steve<BR><BR>========================================================= <BR>- Where merit is not rewarded, excellence fades.<BR>- Hydrogen is pointless without solar.<BR>- What good are laws that only lawyers understand?<BR>- The media's credibility should always be questioned.<BR>- The only good terrorist is a dead terrorist.<BR>- Governments do nothing well, save collect taxes.<BR><BR>-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5<BR>-- Linux Rex | RedWebMail by RedStarWare<BR>-- FatMan: home1.gte.net/res0658s/FatMan/<BR>-- NonFatMan: home1.gte.net/res0658s/electronics/<BR>-- Autodidactic Master of Arcane and Hidden Knowledge.<BR></BLOCKQUOTE><p><hr size=1><font face=arial size=-1>Do you Yahoo!?<br>
<a href="http://us.rd.yahoo.com/evt=23609/*http://promotions.yahoo.com/design_giveaway/static/index2.html">Yahoo! Small Business $15K Web Design Giveaway</a> - Enter today