[Old Grey]

I have 4 different circuits, all with different components, separately working, and they all have a neg component. I tried with PS, PS with reg + & - caps, and even battery power. Unless it's the scope, the only commonalty, I don't know what's up with the wave. They're all basically the same as the pic at the top of the page, but with different values.

I inverted the trans with 5V to "C" and res on "E" to GND, and tapped the wave off the "E" and it fixed the invert. Unfortunately coming off the trans it always produces a smaller Vmax compared to pin 3 on the 555. I'll have more of a play when I get in the mood.

This is pretty close to final, but using edc's osc circuit mod-ed by me. If I can get a simpler more reliable osc circuit I will swap it out.

You will have to "save" it to zoom in.

EDIT - new pic

[androidcho]

I inverted the trans with 5V to "C" and res on "E" to GND, and tapped the wave off the "E" and it fixed the invert. Unfortunately coming off the trans it always produces a smaller Vmax compared to pin 3 on the 555. I'll have more of a play when I get in the mood.
.

I think that you'll need to place a base resistor with smaller value. 680Ohm to 1K maybe.. You can even try with pot attached insead of the resistor.

[Old Grey]

Not used to things working right off the bat.

[The_Boss]

Hi Old Grey are your sim file available for download i want to build a sim thanx

[Old Grey]

That was V2, but after testing it I modified it to fix the things I didn't like.

I haven't actually tested this one, as I already have V2, but it's close enough that it should be ok.
http://speeduino.com/forum/viewtopic.php?f=15&t=853

[The_Boss]

Thanx

[Yury]

Hello everyone !!! I simplified the scheme of Old Gray a little by removing the 555 generator and building it on an arduino-nano. Version with a potentiometer on RPM. If there are people who want to repeat my scheme, write how it works, I have no way to check, I did not assemble speeduino. Thank you Sorry for my English !!! Google translator helps !!!
https://easyeda.com/warlockwolf47/simulator

[debrucer]

Quite a jump from 2016 to 2020. This thread could use a status update. Do we have a board yet? Is there new software that serialUI 3 doesn't break?

[pazi88]

Don't know about this particular board, but there is great alternatives like: https://diy-efi.co.uk/product/speedysim

[subzero]

Hello everyone !!! I simplified the scheme of Old Gray a little by removing the 555 generator and building it on an arduino-nano. Version with a potentiometer on RPM. If there are people who want to repeat my scheme, write how it works, I have no way to check, I did not assemble speeduino. Thank you Sorry for my English !!! Google translator helps !!!
https://easyeda.com/warlockwolf47/simulator

your dsign lacks a ground@ rpm pot