You could make or buy an adapter for SOIC to DIP conversion.
You could buy them at http://www.audioworkshop.com.hk/index_en.htm
You could buy them at http://www.audioworkshop.com.hk/index_en.htm
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alex i live in macon, georgia the heart of the south in the u.s.a. however, i truly envy your chinese sources. most of the places you are able to purchase from will not return my email, in the instances that i can translate there webpage, making purchasing very difficult. i believe you could develop a rather nice semi-profitable venture as a go between. i for one would gladly pay for your services. not only do these sites offer hardware they have some really nice designs.
i am still trying to get this input impedance thing figured out. either transformer or buffer or ths4131 i do not know how to choose and match impedances for correct design. i have the major parts all laid out except for the math part. thanks
i am still trying to get this input impedance thing figured out. either transformer or buffer or ths4131 i do not know how to choose and match impedances for correct design. i have the major parts all laid out except for the math part. thanks
balanced circuit matching
Hi,
using Alexcd posting as an example.
the match pairs are
r1&2
r3&4
r5&6
r7&8
r9&10
and the source coming into ain1 & ain3 must also be matched to similar accuracy.
See Walt Jung for an explanation.
He also recommends the receive end should have high Zin to maximise rejection ratios. Non-inverting can achieve this much better than the inverting buffers shown.
Hi,
using Alexcd posting as an example.
the match pairs are
r1&2
r3&4
r5&6
r7&8
r9&10
and the source coming into ain1 & ain3 must also be matched to similar accuracy.
See Walt Jung for an explanation.
He also recommends the receive end should have high Zin to maximise rejection ratios. Non-inverting can achieve this much better than the inverting buffers shown.
what value is meant by high and what low. there has to be an arbitrary point where one is too work from. i am knew to this. this is my first project. i have to get all of my ducks lined up to get it right
Walt was suggesting up around 1M, he argued well for as high as possible.
Maybe you should go and research.
A similar recommendation comes from Rane.
Maybe you should go and research.
A similar recommendation comes from Rane.
If you could remember the thread I would really appreciate a link or hint at the title. I did not find it in my few minutes of searching the forum.
What's the source? Will the receiver benefit from a bit of filtering?
Better to join the two 1M together and build it truly balanced.
Or just copy Jung.
Better to join the two 1M together and build it truly balanced.
Or just copy Jung.
My source is a run of the mill HT receiver. I would like this to work for anyone with passive preamps as well.
I would really appreciate a link to Jung's circuit or thread.
I would really appreciate a link to Jung's circuit or thread.
AndrewT said:
both your proposal involve interconnects.alexcd said:
I suggest you add some RF filtering.
I gave you the link a few posts back.
You could also consider adding the option to make the two op amps a differential buffer so that all three become a fully differential instrumentation amplifier.
andrew if i installed this circuit in my passive preamp would it not work as a preamp standalone. i could effectively balance every signal coming out of the preamp. would this necessitate the use of a receiver in the amp. do you feel confident in your numbers enough for me to copy and try.
i have also been looking at the linear technology equivalent to these differential chips. they have some nice application notes and i believe jung helped with some of the circuits.
i have also been looking at the linear technology equivalent to these differential chips. they have some nice application notes and i believe jung helped with some of the circuits.
tryonziess said:
I have no confidence in any numbers I invent.
They always need to be proved.
Go and consult Jung.
A balanced output from a source will require a balanced receiver at the other end. Otherwise you are throwing away the small advantage, if any, of adopting balanced through your pre-amp.
i wanted to make sure everyone was still on the same page. This was meant to be a non-balanced to balanced converter but with a few tweaks it can "receive" a fully balanced signal as well.
anyone had any luck with a hot plate and solder paste with smd components. as i get older these parts get smaller and the two do not go together well. since the opa1632 can not be had in dip 8 soldering will be tedious.
Hi Alexcd,
I suggest u to add a toggle switch, to ground R5 directly when doing unbalance to balance conversion. This should give u lower noise.
I suggest u to add a toggle switch, to ground R5 directly when doing unbalance to balance conversion. This should give u lower noise.
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