Electronics > Beginners
transistor replacement for VCO?
FrankBuss:
I would like to experiment a bit with a VCO, as described on page 13/14, figure 14/15 in this document: http://www.ti.com/lit/an/snoa665c/snoa665c.pdf
I can get all the OpAmps, comparators and voltage references, but the transistors are out of production or really expensive. Which replacement parts could I use? I need the following transistors:
- 2N3810
- LM394
- 2N4392
- 2N2369
Would be good to get it all at Digikey. Some of the transistors are available there, but would be nice to have everything as SMD, too and not too expensive (usually transistors should cost only cents). And is there a SMD alternative for the LM329?
JPortici:
AS394: http://www.ericasynths.lv/en/shop/diy/diy-accessories/as394-matched-transistors/
:) works well
FrankBuss:
--- Quote from: JPortici on June 21, 2017, 09:51:45 am ---AS394: http://www.ericasynths.lv/en/shop/diy/diy-accessories/as394-matched-transistors/
:) works well
--- End quote ---
For all of them? And EUR 3 is still expensive, and I don't get them as SMD at Digikey. But I found another IC, the LM13700. Looks like it is easy to create a VCO with it, and it is available for not too much money in SMD at Digikey :)
JPortici:
yes, it is. you have plenty of examples in the datasheet
there are COUNTLESS vcos build with the ca3080 and its derivates (cem chips, lm13700 and such)
there is also a tri->sine waveshaper which uses the arctan transfer function of the inputs, but i don't remember if it's included in the datasheet
floobydust:
Curtis CEM3340 VCO is back in production, popular for analog synths since the 1980's.
Linear Systems makes several dual matched transistors, dual JFETS too. Example LS311 dual monolithic NPN transistors.
Navigation
[0] Message Index
[#] Next page
Go to full version