[sdiy] passive ring modulator transformers

[Magnus Danielson]

Simon,

Replacing the transformers with op-amps should be possible, but should 
be done with some care, but should be solvable. Like the idea.

The op-amp circuits need to handle common mode and differential mode 
voltages separately. Depending on which port is being driven, the op-amp 
design should be done accordingly.

BTW, good DBM have been achieved using 2N2222A transistors wired as 
diodes. That achieved really good S/N properties with standard transformers.

Cheers,
Magnus


On 01/17/2016 12:29 PM, Simon Brouwer wrote:
> Hi, slightly off-topic,
> I imagine a big part of the sonic difference between the
> transformer-and-diode-ring modulator and analog-multiplier circuits is
> the nonlinear behaviour of the diode ring.
> If the transformers do not contribute a lot of distortion (assuming that
> in this application they are not driven to saturation), they might be
> replaced by opamp circuits without losing much of the characteristic sound.
> Best regards
> Simon
>> Op 16 januari 2016 om 23:26 schreef alfred.pear at gmail.com:
>>
>> hello SDIYers,
>>
>> i'm currently trying to figure out how to get reasonably affordable
>> transformers for a passive ring modulator.
>>
>> i'm finding that terminology like "audio transformer" does not
>> necessarily correspond to a 20hz to 20khz frequency response - and
>> that those types of transformers seem quite rare & expensive. i
>> realize low frequency is a perpetual problem in the x-former world,
>> but it would be nice to find something that reliably reached a low of
>> 100hz.
>>
>> i was wondering if people had any go-to sources for the kind of
>> solution i'm looking for.
>>
>> thanks,
>> yAP yAP
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