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100uF Capacitor |
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120pF Capacitor |
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100nF Capacitor |
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3mm LED |
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3.5mm Audio Jack |
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IDC 2x8 PCB Header |
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JST 6-pin PCB Header |
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1x16 P2.54 Pin Header |
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1x16 P2.54 Pin Sockets |
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BC559 |
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10k 1/4W resistor |
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20k Resistor |
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100r Resistor |
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47k Resistor |
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680R 1/4W resistor |
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MFR50SFTE52-100KYAGEO
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LM13700 |
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TL072IPTexas Instruments
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8-pin DIP Socket |
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16-pin DIP Socket |
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12mm Hex Standoff |
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M3 Nut |
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M3 Pan Head, 5mm Screws |
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KiCADKicad
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MiniVCA - An LM13700-based Voltage Controlled Amplifier for modular synthesizer
See full write-up on my blog: https://benjiaomodular.com/post/2021-12-17-lm13700-vca/.
I’ve been relying on DIY Vactrols for my VCAs for the longest time.
They’re very easy to build and they work alright. My problem with them, though, is that their response when doing swells isn’t that good. They would start out quiet then ramp up really quick to max volume.
To address this, I decided to upgrade my Voltage Controlled Amplifiers from Vactrols to this LM13700-based one inspired by Juanito Moore’s design. A demo of my perfboard prototype for this can be found on Youtube. I'm working on a demo of the PCB build. But I can confirm that it works!
Compared to my LED vactrol VCA’s this one has a more linear response to the CV input which lets me do smoother swells and fades with my ADSR. I also put in a secondary CV input so I can add texture and movement from an LFO.
The control board and the main board are connected through a 12mm M3 brass standoff, an M3 screw and an M3 nut.
You can find updates and demos of this project through my blog. You can also reach out to me through Instagram @benjiaomodular.
MiniVCA - An LM13700-based Voltage Controlled Amplifier for modular synthesizer
*PCBWay community is a shared platform and we are not responsible for any design issues.
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