[sdiy] Passive Ring Modulator

[Steve Begin]

I remember I looked it up once before and I'm pretty sure I actually found
an equivalent diode, but I gave up when I couldn't find any reference to the
transformer they suggested. Now I can't seem to find the diode either.
 
Ian: Sorry to be so much trouble, but could you tell what diode is being
used on your board as well?  

All the talk of fets and opamps is over my head (hopefully I'll catch on
eventually).  At this point I'd probably rather take the approach I'm most
likely to understand over the cleanest or easiest approach. :)

Steve Begin



-----Original Message-----
From: Terrence McWee [mailto:mcwee at m-net.arbornet.org]
Sent: Sunday, July 14, 2002 12:51 PM
To: ian
Cc: Steve Begin
Subject: Re: [sdiy] Passive Ring Modulator


Steve & Ian,

I'm yet another dreadfully newbie SDIYer, so please bear with my dumb 
questions.

I'm getting pretty hyped up on this passive ring mod, and note that the 
design calls for "Four (4) diodes GE45A or equivalent."  What, 
precisely, constitutes a suitable equivalent to this?  I can't make 
heads/tails of that ID number.

Thanks,
T.M.

On Friday, July 12, 2002, at 12:55  PM, ian wrote:

> Hi Steve,
> I have a boxful of ringmods much like this sitting on my desk right 
> now! I
> haven't had a chance to try them out yet, but other people who have 
> tried
> them say they sound great. The design I have was given to me by a
> colleague, and it comes from the Amateur Radio Relay League handbook. It
> differs slightly from the one on sonicstate, as it has two diode rings,
> which is supposed to provide better carrier rejection than the single
> diode ring design. As for the transformers, the ringmods I have use one
> from Mouser, marked TL028 down one side and 0109S down the other.
> Ian
>
>
> On Fri, 12 Jul 2002, Steve Begin wrote:
>
>> Hi, I'm new to the list, not new to analog (am I gonna get in trouble 
>> if I
>> spell it like that?)
>>  gear, but fairly inexperienced when it comes to circuitry.
>>
>> I've got a question, has anybody had any experience with a passive ring
>> modulator design like this one?
>> http://www.sonicstate.com/synthfool/ringmod.html
>>
>> I'm interested in it since it looks very easy to make and cheap and if 
>> it
>> doesn't work as well as other designs it doesn't bother me that much.
>> However,  I guess the stancor a-4713 driver transformers are no longer 
>> in
>> production and I can't seem to find anything information on them at 
>> all, let
>> alone a reference to a part I could use as a substitute.
>> I'd really appreciate it if somebody could give me any direction at all
>> here.
>>
>> The other thing I was wondering about (and I'm sure it's probably 
>> painfully
>> obvious to a lot of you) was half or full normalled patch bays.  When 
>> you
>> split a signal doesn't it affect the impedance or something along those
>> lines?  I thought it would be a bad thing to do but I haven't seen 
>> anybody
>> mention any problems with that.
>> How about combining signals without a mixer?  I'm almost positive you 
>> get
>> problems doing that.
>>
>> Thanks!
>>
>>> Steve Begin
>>>
>>>
>>>
>>
>
>
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