The VCO-555

fonik · Posted: Sat Sep 22, 2012 1:38 pm Post subject:

so i finally got around finishing this build. it is the old prototype PCB. i left off the PMW of the front panel (it is on the board, though).
therefor i added a feature that is not part of the circuit/PCB. i added a VCO/LFO switch that switches a larger cap in parallel to the original timing cap, and connects a LED to the core saw.

will have to calibrate it still.

AlasdairMoons · Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium

the build looks good ..
waiting for soundsamples Smile

mcop · Joined: Apr 27, 2012 Posts: 46 Location: Brighton UK

Nice build.

Is the extra range capacitor going to be included on the final board?

fonik · Posted: Sat Sep 22, 2012 2:37 pm Post subject:

mcop · Joined: Apr 27, 2012 Posts: 46 Location: Brighton UK

I can understand that. Adding a range switch would be easy anyway. I just wondered as I like the idea of being able to use it as an LFO as well. I like the idea of building modules to be as flexible as possible.

J3RK · Joined: Jun 05, 2006 Posts: 123 Location: Seattle

Your board/panel look great! Nice work! Interesting thermal coupling on the transistors (is that what I'm seeing?) Do you have a closer shot of this? What did you use there?

telbonic · Joined: Jan 08, 2010 Posts: 39 Location: uk

Samples or it didn't happen Very Happy

fonik · Posted: Mon Oct 15, 2012 9:41 pm Post subject:

so i just made a VERY simple demo, just to proof it's amazing quality. the tracking is awesome:

Thomas Henry's 555-VCO from fonitronik on Vimeo.

elmegil · Posted: Mon Oct 15, 2012 10:35 pm Post subject:

You're determined to eat up all my budget aren't you? Very Happy

i was planning on the LFO, but now I think I will have to get this PCB too!

fonik · Posted: Tue Oct 16, 2012 3:31 am Post subject:

you are welcome Laughing

anyways, i think i am at the lower end in regards to PCB prices, no?

elmegil · Posted: Tue Oct 16, 2012 5:15 am Post subject:

Definitely, but there are so MANY good ones Wink

ashleym · Joined: Aug 20, 2009 Posts: 181 Location: uk

A few points

Fonik, I cant cope, I really cant. Thanks for doing what your are doing!!

Ian

synthcube · Joined: Dec 21, 2011 Posts: 64 Location: boston

Yeah, me too. Lots of talented people who don't get enough money for their creativity or hard work.

stahlblau · Joined: Jan 24, 2008 Posts: 17 Location: Herford / Germany

Wow... great work. Are the PCBs available?

I think i would take 2 or three of them Wink

fonik · Posted: Tue Oct 23, 2012 3:36 am Post subject:

no PCBs yet. will have to order another prototype PCB for the frontpanel components...

stahlblau · Joined: Jan 24, 2008 Posts: 17 Location: Herford / Germany

ok, thank you

marvkaye · Joined: Mar 14, 2011 Posts: 225 Location: Fla

AlasdairMoons · Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium

dave_3283 · Joined: Jan 30, 2009 Posts: 28 Location: Dallas TX

Yeah, ditto. It sounds amazing, is a simple build, and sounds amazing. Also, it sounds AMAZING. I'm in for 2.

fonik · Posted: Tue Oct 23, 2012 12:36 pm Post subject:

diablojoy · Posted: Tue Oct 23, 2012 5:32 pm Post subject:

That does sound really good, sync works well.
did note the sine level is quite a bit down though.
still i think i will have to buy a couple at least.

fonik · Posted: Wed Oct 24, 2012 12:57 am Post subject:

diablojoy · Posted: Wed Oct 24, 2012 3:02 pm Post subject:

Thomas_Henry · Posted: Wed Oct 24, 2012 5:37 pm Post subject:

Hi all,

Yes, the redoubtable Kansan, Scott Stites, and I spent a huge amount of time getting the amplitudes right on the various outputs (including an interesting trick along the way). If you check my measurements in the original post, you'll see that only the triangle is off by several tenths, but the other signals are dead on. (Or at least they were on the breadboards for Scott and me).

So, I wouldn't worry about it, unless Fonik turns up something we missed entirely.

Thomas Henry

fonik · Posted: Fri Oct 26, 2012 12:31 pm Post subject: