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 Forum index » DIY Hardware and Software
TZFM SAW VCO
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thermionicjunky



Joined: Dec 07, 2006
Posts: 90
Location: san francisco

PostPosted: Fri Jan 23, 2015 7:57 am    Post subject: Reply with quote  Mark this post and the followings unread

emmaker wrote:
I'm building up some of my backlog and working on a +/- 15V Teezer using the Bridechamber parts kit. I'm going to use the zener substitutes to get it to work with 15 volts too.

The quantities in the kit for some of the resistors is off, some missing and some values not on the BOM are in the kit. Also out of the stock 6 zeners, 2 are correct, there are 2 6.X volt ones and 2 are missing. Got a 33pf cap too which I can't find in the BOM.


33p is an alternate value for C6. Check this page for possible explanation of BOM discrepancies.

http://modularsynthesis.com/bridechamber/tzfm/tzfm.htm
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Joona



Joined: Aug 22, 2015
Posts: 2
Location: Finland

PostPosted: Sun Aug 23, 2015 4:53 am    Post subject: Reply with quote  Mark this post and the followings unread

I was thinking that I'll shove this into an eurorack (and I don't have the 650$ to spend on the ready made at the moment + DIY is nice). I'll get the pcb from Bridechamber, probably the part kit too. If I just turn the PCB 90 degrees so the shorter edge will be against the panel and wire all the knobs it should fit just fine. As the schematics are not available, do I need to make any other modifications concerning CVs etc?

This'll be the first module I'll be making though I do have quite a lot of experience on soldering and electronics otherwise. I'll most likely end up getting two of these. They'll be my first and only oscillators for a while (unless I get something for LFOs that can do audio range, FC System X should be able to do both roles for a while, and so should the Quadslope I have...). Panels will probably be ordered from Front Panel Express.
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thermionicjunky



Joined: Dec 07, 2006
Posts: 90
Location: san francisco

PostPosted: Mon Aug 24, 2015 7:31 am    Post subject: Reply with quote  Mark this post and the followings unread

Joona wrote:
I was thinking that I'll shove this into an eurorack (and I don't have the 650$ to spend on the ready made at the moment + DIY is nice). I'll get the pcb from Bridechamber, probably the part kit too. If I just turn the PCB 90 degrees so the shorter edge will be against the panel and wire all the knobs it should fit just fine. As the schematics are not available, do I need to make any other modifications concerning CVs etc?

This'll be the first module I'll be making though I do have quite a lot of experience on soldering and electronics otherwise. I'll most likely end up getting two of these. They'll be my first and only oscillators for a while (unless I get something for LFOs that can do audio range, FC System X should be able to do both roles for a while, and so should the Quadslope I have...). Panels will probably be ordered from Front Panel Express.


You get the schematics when you order the PCB (email Scott if he forgets). It is designed for +-12v, so no modifications are required.
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Joona



Joined: Aug 22, 2015
Posts: 2
Location: Finland

PostPosted: Mon Aug 24, 2015 9:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Great, thanks.
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stevebryson



Joined: Nov 15, 2014
Posts: 14
Location: San Rafael, CA

PostPosted: Fri Sep 11, 2015 11:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

[edit: Fixed! Details in the next post]
Hi Folks - I just finished my first Teezer, and it has problems.
First, what's right: I get saw, tri and sine (sorta) outputs, and the init freq pot behaves as expected, with output frequencies of about 110 KHz at both ends of the init freq pot. The frequency goes through zero as the init freq knob goes through noon.

What's wrong: I get essentially no response from the coarse/fine knobs or from inputs to 1V/Oct. Using the troubleshooting info on this thread I find the following most suspicious:

With the freq init knob all the way left, as I turn the coarse knob from full left to full right I see:
- at A1a output: 0.44V to -0.094V (similar to what Ian says is OK)
- at A1b output: 0.705V to 8.32V (high end about twice what Ian said is OK, but in the right direction)
- at R23 on the side connected with pin 1 of the MAT03 chip (really an SSM 2220): 0.435V to -0.101V (very different from what Ian says is OK!)

Does that mean the SSM 2220 is bad? (of course it does - it's the only chip covered with nasty heat sink compound so this is the pcb equivalent of toast landing butter side down Evil or Very Mad )

This is a 15V build from the bridechamber kit, using Dave Brown's mods. All the other voltages I checked look right.

Thanks for your help!

Last edited by stevebryson on Sat Sep 12, 2015 12:54 am; edited 1 time in total
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stevebryson



Joined: Nov 15, 2014
Posts: 14
Location: San Rafael, CA

PostPosted: Sat Sep 12, 2015 12:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Ha! After reading the discussion about crud around the a798 pads I looked at the bottom of the PCB and noticed a very small spur of metal from one of the pads almost touching the next pad. It was not shorting according to my DMM, but I scraped the channel between the pads anyway and saw that some white stuff came out. Put it all back together and now it works!!

With the init freq at the extremes, I'm seeing +-5V output frequencies of too low to measure (or I'm not patient enough but it is oscillating) to about 110 KHz. 1V/Oct input is working and not too far off Very Happy Smile flower cat party time!

On to calibrating and adjusting! jackson dancing

What a great thread!
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Starspawn



Joined: Jun 14, 2013
Posts: 84
Location: Oslo

PostPosted: Sun Jan 31, 2016 12:42 pm    Post subject: Saw for 5pulser? Reply with quote  Mark this post and the followings unread

Ive bought a bunch of Fritz PCBs to make a little system, and also have among other utility stripboard circuits I plan to add, a 5 Pulser made after the 0-5V input schematic.
Now with my teezer, is there somewhere I can tap a 0-5V saw for 5-pulser use without disturbing the circuit, or should I just buffer and shift the saw out?
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thermionicjunky



Joined: Dec 07, 2006
Posts: 90
Location: san francisco

PostPosted: Tue Feb 02, 2016 9:32 am    Post subject: Re: Saw for 5pulser? Reply with quote  Mark this post and the followings unread

Starspawn wrote:
Ive bought a bunch of Fritz PCBs to make a little system, and also have among other utility stripboard circuits I plan to add, a 5 Pulser made after the 0-5V input schematic.
Now with my teezer, is there somewhere I can tap a 0-5V saw for 5-pulser use without disturbing the circuit, or should I just buffer and shift the saw out?


Why not use the +-5v version of the 5pulser that includes the correct input buffer? This would be neater, and it would be easier to use with other VCOs. Even if you've already built the 0-5v version, it's a fairly simple conversion.
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Starspawn



Joined: Jun 14, 2013
Posts: 84
Location: Oslo

PostPosted: Tue Feb 02, 2016 10:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, fair enough, last time I looked at it that looked much harder, must have learnt something Smile
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