LM317 / LM338 / LM350 Voltage/Current Regulator Calculator 
http://diyaudioprojects.com/Technical/V ... Regulator/

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On Zener diodes 
http://www.youtube.com/watch?v=GfaVbKaw5Nk&t=20m45s

http://www.opamplabs.com/zenerreg.htm

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Ebastlirna 
http://www.ebastlirna.cz/modules.php?na ... m&f=41

http://www.aldebaran.cz/

http://www.mylms.cz/text-23-operacni-ze ... -zapojeni/

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logamp exists 
exp. amplifiers wiki

http://en.wikipedia.org/wiki/Operationa ... ial_output

log opamp

http://www.newark.com/texas-instruments ... dp/20M5563

ti. exp. circuit

http://www.ti.com/lit/an/snoa641a/snoa641a.pdf

exp. function

http://www.matweb.cz/exponencialni-funkce

log amps pdf.

http://www.electronics.dit.ie/staff/ypa ... ifiers.pdf

log amp.

http://www.ecti-thailand.org/assets/pap ... pub_24.pdf

prototyping circuit board
http://www.ebay.com/itm/Pack-of-6-Proto ... 256bc6a3d3


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Juno 106 square wave 


+-0.8V amplitude
3,4ms / 1 cycle = 1000 ms / 3,4 ms = 286 cycles / s = 294 Hz =~ D4 (293.7 Hz)

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Transistor biasing 
http://www-personal.engin.umd.umich.edu ... 20Bias.pdf

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http://www.till.com/articles/moog/patents.html patents :D 
http://www.till.com/articles/moog/patents.html

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MCP601/602/603 rail to rail opamp (single sourced) oscillator circuit schematics 
picture below shows oscillator which uses rail to rail opamp MCP601/MCP602/MCP603 powered with single source (virtual ground).



http://youtu.be/QLQrLO0zvDI
<- nice explanation why oscillator starts oscillation. it is important to provide circuit with +/- Voltage otherwise capacitor will not start the cycle of chaging and discharging controlled by opamps output voltage.




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VCO 
http://www.falstad.com/circuit/e-vco.html

http://hyperphysics.phy-astr.gsu.edu/hb ... re.html#c2

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Oscilating opamp 
http://www.falstad.com/circuit/#%24+1+5 ... 25+0+-1%0A

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