Search
Menu
Special Pages
Login
No picture available
Connect a picture (already uploaded)
Add a new picture

VCA-3B

Dual 13700 linear VCA - design by Paia

Courtesy/Thanks to: Resonant Frequency and Paia

Description: After the CA3080 went obsolete, I began looking for a simple VCA circuit to replace the design used for VCA-2A. Both the NJM13600 and NJM13700 are still available from New Japan Radio, so I thought they would be good OTAs for experimentation. I drew a circuit board of a dual VCA, with the design taken from the Paia Fatman (although the fatman only has a single VCA). You may download the schematic for VCA-3B here. Please note that the board layout is a component side view, not a solder-side view.

I'm quite happy with the results: Quiet operation and acceptable CV feed-through. I may decide to revisit this design later an add a 2 transistor expo converter, and perhaps add adjustable make-up gain on the output buffer.

Comments

You need to be logged in to add a comment.

Editing and adding
You need to be logged in to edit and add files and urls etc.
Categories & Tags
Popular tags for this:
VCA 


You must be logged in to add tags.

Inventory & Trading

You need to be logged in to administer your inventory

No one is selling this product at this time.

Similar on Ebay
Files
vca-3b.pdf
   Schematics and PCB layout for the VCA-3B
Parts used
2N4126
   PNP General Purpose Amplifier
LM13600
   Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
1N914
   High Conductance Fast Diode
LM13700
   Dual Operational Transconductance Amplifier with Linearizing Diodes and Buffers