[sdiy] Is there room for evereyone?

[Ken Stone]

Pretty much. Though like transistors, you have to do it at a constant
temperature, without handling the diodes. Set them up the day before in a
piece of that white "harry hates it" bread board. The following day measure
their voltage drop and record it on a piece of paper near by. Do so without
touching the diodes yourself, and do it in a "window of constant
temperature", for example before you turn the heater on in the morning.

Ken

>Is matching diodes simply a matter of finding diodes with equal
>voltage drops or is it more involved like with transistors?
>
>-Tavys
>
>On 8/7/06, anthony <aankrom at bluemarble.net> wrote:
>> Oh I meant a complete module called a "ring modulator" using a real diode
>> ring. I was also thinking about how almost every synth company ever used a 4
>> quadrant multiplier for their so caled "ring modulators".
>>
>> I made one based on Ken's shcematic, but I don't think the transformers are
>> quite right - they were from an identical pair of telephones. The upshot of
>> it is I now have 3 huge batches of matched Ge diodes - 60's vintage Ge
>> diodes that came from a piece of Hewlett Packard gear that had over 150 of
>> them in it. ALthough now that I think about it I think I ended up using
>> somwe matched 1N277's that I matched as well.
>>
>> > On Mon, Aug 07, 2006 at 08:08:29PM -0400, anthony wrote:
>> >> Yeah! See? Actually I think your Real Ring Modulator is one of the
>> >> coolest
>> >> things ever and if I had the dough, it'd be the first thing I ordered.
>> >> And
>> >> do you know how many other vendors sell such a thing? ZERO.
>> >
>> > Mouser 42TM018   ( $3.82 for 2 )
>> > Mouser 526-1N34A ( $4.10 for 10 )
>> >
>> > That gives you the two transformers, and 10 germanium diodes to test for
>> > matching.  When I bought diodes from Mouser they were all close enough to
>> > use, thats why I now have 4 passive ringmods.
>> >
>> > Oh, and for an old schematic :
>> > http://www.synthfool.com/ringmod.html
>> >
>> > the Stancor A-4713 is a 10k/10k transformer hence the above listed mouser
>> > part number.
>> >
>> > --
>> > -----------------------------------------------------------------
>> > - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org
>> > - SynthGeek        -
>> > - BBD Fanatic      -  "...is it a virus, a drug, or a religion?"
>> > - echo evho wjxo   -    Juanita Shrugs. "What's the difference?"
>> > --------------------
>> >
>> >
>>
>>
>>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>