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 Forum index » DIY Hardware and Software » Thomas Henry designs
555 vco
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braincell



Joined: Jun 24, 2015
Posts: 14
Location: UK

PostPosted: Sun Jun 28, 2015 11:46 am    Post subject: 555 vco
Subject description: 555 vco
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Hi Everyone,
I decided to build myself an analogue synth........ And teach myself analogue electronics too.....

Bit of a tall ask I know but I decided on a 555 vco as my first unit after hearing a sound sample.

So I joined this site and messaged a member to get a pcb , but it looks like I missed out on the last run........

So I thought I will learn Eaglecad and draw one up myself...... *facepalm*

just under a week later I managed it Very Happy

Attached is the schematic :-

here is a link to dirtypcbs if anyone wants to take a chance on a board ....

***removed***

*** ABSOLUTELY NO WARRANTY OR ANY RESPONSIBILITY TAKEN ***


th555vco schematic + lfo.png
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555 vco schematic with lfo mod
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braincell



Joined: Jun 24, 2015
Posts: 14
Location: UK

PostPosted: Thu Oct 15, 2015 5:43 am    Post subject:  555 vco
Subject description: here we go......
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So after receiveing the boards back from dirtyPCB's i built up the boards and NOTHING.....

No output , Just a lot of heat from the OP-AMPS.......GUTTED!!!!!

Took a break for a couple of days and then looked again with fresh eyes and found EAGLE crossed over some wires because i laid a resistor symbol over the transistors......

Lesson learned , PCB v0.2 went to board house and came back.

As bought in batches of 10 i made 1 up and it looks great , so i populated another 3 Very Happy

Black board at back is MIDI2CV Very Happy .... waiting on components to finish.

White board at right is TH ADSR , again waiting on components Very Happy

Have drawn up 7 other boards too , Synth here we come Very Happy


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LFLab



Joined: Dec 17, 2009
Posts: 283
Location: Rosmalen, Netherlands

PostPosted: Fri Oct 16, 2015 12:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Good work!

I also prefer laying out my own boards, so I am familiar with the layout when I start plugging in components, and the stuff I already have in my parts stash fits.
Which ADSR did you do? The one with or without "light show"?
I have a board ready to go for the version with LED's, and I will be using illuminated sliders, should be good.
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braincell



Joined: Jun 24, 2015
Posts: 14
Location: UK

PostPosted: Fri Oct 16, 2015 7:37 am    Post subject: Reply with quote  Mark this post and the followings unread

hi , Its the fonik 4u version i think..... unsure if its gonna run yet Smile
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braincell



Joined: Jun 24, 2015
Posts: 14
Location: UK

PostPosted: Fri Oct 23, 2015 5:12 am    Post subject: 555 vco Reply with quote  Mark this post and the followings unread

Hi All,
The 555 vco board works perfectly so im uploading the eagle files incase anyone wants to run some off.........

I recommend "DIRTYPCB'S" protopack 10+/- 1 for $25 dollars

Lee


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braincell



Joined: Jun 24, 2015
Posts: 14
Location: UK

PostPosted: Fri Oct 23, 2015 10:50 am    Post subject: cv ringmod Reply with quote  Mark this post and the followings unread

Hi All,
CV Ringmod buit and tested Smile here the schematic and Board for EAGLE.


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braincell



Joined: Jun 24, 2015
Posts: 14
Location: UK

PostPosted: Fri Oct 23, 2015 10:58 am    Post subject: gratuitous scope shot Reply with quote  Mark this post and the followings unread

Heres my scope showing the fm on the 555 vco Very Happy


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coaxlix



Joined: Oct 22, 2015
Posts: 3
Location: denmark

PostPosted: Fri Nov 13, 2015 4:07 am    Post subject: Re: cv ringmod Reply with quote  Mark this post and the followings unread

braincell wrote:
Hi All,
CV Ringmod buit and tested Smile here the schematic and Board for EAGLE.


I just ordered a set of your vco 555 layout. Mr. Green

What/whose design is this CV ringmod. Is there a link somewhere to the documentation?
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braincell



Joined: Jun 24, 2015
Posts: 14
Location: UK

PostPosted: Sun Nov 15, 2015 4:40 am    Post subject: ringmod
Subject description: VC RINGMODULATOR
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Hi,
The VC Ring Mod is foniks i think , i got the schematic online.

I dont think theres anything to tune really as the pots seem to control the modulation.

I built it and it just works...... Very Happy

I used cheap schinese tl074's and 13700 in all theses modules (Ebay) and they seem to work well.

Lee
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braincell



Joined: Jun 24, 2015
Posts: 14
Location: UK

PostPosted: Sun Nov 15, 2015 4:46 am    Post subject: Buffered multiple
Subject description: MULTIPLE
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Hi All,
Heres a scheme and board for a buffered - linked multiple and various LED Drivers on a board.

As you can see from the Scheme there provision to add attenuators to the multiple or bypass them and link both 4's to make 8.

Also a line out from 1 port too

4 standard BI-Colour LED drivers and also a TRI Colour LED driver showing level posted by TH on this site somewhere

UNTESTED yet but im waiting for my boards to arrive Smile

LEE


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coaxlix



Joined: Oct 22, 2015
Posts: 3
Location: denmark

PostPosted: Thu Nov 19, 2015 3:06 am    Post subject: Re: 555 vco Reply with quote  Mark this post and the followings unread

braincell wrote:
Hi All,
The 555 vco board works perfectly so im uploading the eagle files incase anyone wants to run some off.........

I recommend "DIRTYPCB'S" protopack 10+/- 1 for $25 dollars

Lee


Hi

Looking at your schematics I see, that you've added an additional IC (IC5) and two additional jacks (LINK and JP11) that are not in TH's originals. What are these for?
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braincell



Joined: Jun 24, 2015
Posts: 14
Location: UK

PostPosted: Thu Nov 19, 2015 6:09 am    Post subject: additional parts
Subject description: foniks mod
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Hi,
These are Foniks mod i think i found the schematic out there in internet land , cant remember where.

But i have attached a small pic showing how to wire a DPDT switch in to turn this VCO into an LFO with rate LED. Very Happy

Be sure to use a 2 pin Bi-Color LED (I chose red/blue).

The link is simply just that, as you can see in the schematic it simply supplys the LED buffer OPAMP with a signal. Just bridge the link.

JP 11 = Bi-Color LED signal (after a switch)

JP 13 = other side of the switch to change the timing capacitor from just C4 to C4 PLUS C4B (1uF)

Hope this helps Smile


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coaxlix



Joined: Oct 22, 2015
Posts: 3
Location: denmark

PostPosted: Thu Nov 19, 2015 2:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ok! Thanks, I wouldn't have figured that out on my own.
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