WARNING!! Hijacking in progress
Hijacking in progress!!!
I interrupt this program for a brief question!!
Hi All-
I am researching threads about good signal relays for a switching project I am working on and figured I would ask a question.
I am looking for a logic circuit to turn on 1-4 relays using 4 buttons for direct access to a relay. Only one relay can be operational at a time, and they must have direct access from its respective button, which would turn off all other relays.
In essence the same as a preamp with multiple inputs and 1-to-1 correlating selector buttons but I will be using for distribution, not input selection.
I would appreciate any assistance on this matter.
Thanks again,
Troy
NOW back to your thread about best sounding relays!!!
Hijacking in progress!!!
I interrupt this program for a brief question!!
Hi All-
I am researching threads about good signal relays for a switching project I am working on and figured I would ask a question.
I am looking for a logic circuit to turn on 1-4 relays using 4 buttons for direct access to a relay. Only one relay can be operational at a time, and they must have direct access from its respective button, which would turn off all other relays.
In essence the same as a preamp with multiple inputs and 1-to-1 correlating selector buttons but I will be using for distribution, not input selection.
I would appreciate any assistance on this matter.
Thanks again,
Troy
NOW back to your thread about best sounding relays!!!
Per,
there are other reasons for using latching relays. For example,
if you are concerned about thermal EMF, you'd use latching relays so that there is minimal heating of the contacts due to coil
heating, and hence, lower thermal EMF due to less temperature rise. Similarly, you might want minimal potential for noise
induced due to noisy relay power. Also, a latching relay
is likely to have a longer life since the coil is not likely to
burn out due to constant use.
Daniel, you want specific Coto reed relay suggestions:
I've used the 29xx series and the 900x series. I've also
used some of the low thermal EMF relays (don't remember
the p/n's). A design currently in the works will use the
9012 and 2341 series relays. (I believe those are the correct
numbers, but I'm currently 2Mm away from my parts list)
there are other reasons for using latching relays. For example,
if you are concerned about thermal EMF, you'd use latching relays so that there is minimal heating of the contacts due to coil
heating, and hence, lower thermal EMF due to less temperature rise. Similarly, you might want minimal potential for noise
induced due to noisy relay power. Also, a latching relay
is likely to have a longer life since the coil is not likely to
burn out due to constant use.
Daniel, you want specific Coto reed relay suggestions:
I've used the 29xx series and the 900x series. I've also
used some of the low thermal EMF relays (don't remember
the p/n's). A design currently in the works will use the
9012 and 2341 series relays. (I believe those are the correct
numbers, but I'm currently 2Mm away from my parts list)
Daniel,
the only relays I've "listened" to are in my passive preamp and
they are some NASA surplus units from the Apollo program. They
seem to work just fine in my system and do not seem to be the
limiting factor.
I've used the Coto relays as well as various NAIS units in precision
instrumentation applications (precision DC msmts. as well as
FFT analyzer applications and RF applications) Coto's have all
worked well. NAIS/Aromat have had various problems previously
mentioned.
BTW, "buzzing" in my terminology means exercising them at
a fairly fast rate for several minutes to break them in and reveal
any infant mortality problems.
charitable response to your question:
I don't think that relay useage is very high among DIY
audiophiles as many seem to use fancy, big, expensive switches.
It's doubtful you'll find many people who have done comparative
listening. I was quite surprised to find the likes of various
high-end manufacturers using relays that I know to have
serious quality and reliability problems.
I tend to stay with brands and models that I can trust
based on my professional engineering experience. Often
my preferences and experience match up to what the DIY
audio crowd (or high-end commercial equipment) use and
sometimes not.
Personally, my life is too busy to do A/B listening tests
of relays. If you have the time, go for it.
the only relays I've "listened" to are in my passive preamp and
they are some NASA surplus units from the Apollo program. They
seem to work just fine in my system and do not seem to be the
limiting factor.
I've used the Coto relays as well as various NAIS units in precision
instrumentation applications (precision DC msmts. as well as
FFT analyzer applications and RF applications) Coto's have all
worked well. NAIS/Aromat have had various problems previously
mentioned.
BTW, "buzzing" in my terminology means exercising them at
a fairly fast rate for several minutes to break them in and reveal
any infant mortality problems.
charitable response to your question:
I don't think that relay useage is very high among DIY
audiophiles as many seem to use fancy, big, expensive switches.
It's doubtful you'll find many people who have done comparative
listening. I was quite surprised to find the likes of various
high-end manufacturers using relays that I know to have
serious quality and reliability problems.
I tend to stay with brands and models that I can trust
based on my professional engineering experience. Often
my preferences and experience match up to what the DIY
audio crowd (or high-end commercial equipment) use and
sometimes not.
Personally, my life is too busy to do A/B listening tests
of relays. If you have the time, go for it.
Only problem that I have seen with NAIS relays........
There is very little clearance between the moving parts and the case. If you deform the case, like drip solder on it, it won't operate properly.
I agree with Brian L............I have other things to do than listen to relay A/B tests. Buy one with low minimum voltage and current ratings for the contacts....................
Jocko
There is very little clearance between the moving parts and the case. If you deform the case, like drip solder on it, it won't operate properly.
I agree with Brian L............I have other things to do than listen to relay A/B tests. Buy one with low minimum voltage and current ratings for the contacts....................
Jocko
Diode assistance
Hi All-
I was hoping someone could elaborate on LBHajdu's post (# 27) earlier in this thread.
I have a simple diagram attached and any assistance on the diode placement would be appreciated.
Please disregard the drawing if it is easier to start from scratch.
Thank you in advance,
Troy (stgrab@yahoo.com)
Hi All-
I was hoping someone could elaborate on LBHajdu's post (# 27) earlier in this thread.
I have a simple diagram attached and any assistance on the diode placement would be appreciated.
Please disregard the drawing if it is easier to start from scratch.
Thank you in advance,
Troy (stgrab@yahoo.com)
Attachments
There has been a listening test in a german audio magazine some years ago... I've to dig deep to find it..
But I remembered the outcome : the best sounding relay was a mercury wetted relay from Clare.
The contact is made with a small drop of mercury which ensures very good contact especially for low signals/currents.
The only thing that remains is the (electric)magnetic field that can influence the sound
If I can find the test, I'll try to post it.
Dick
But I remembered the outcome : the best sounding relay was a mercury wetted relay from Clare.
The contact is made with a small drop of mercury which ensures very good contact especially for low signals/currents.
The only thing that remains is the (electric)magnetic field that can influence the sound
If I can find the test, I'll try to post it.
Dick
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