RCD 965 Muting Transistors to a Relay. How? (components or something I buy/install)
So I can see the four (half round) Muting Transistors T109 - T112.
I understand I can clip or desolder them and don't need jumpers. Many say afterwards, they hear little or no noise and pops. Others say they hear different degrees of noise and pops with power off/on and changing CDs/tracks. All say the musical improvement is amazing! So I am moving forward.
It seems Muting relays are a superior solution. No pops or noise and the musical improvement is the same as removing the transistors. This is what I prefer but will settle (like it would be settling) for just removing the muting transistors.
So here is the question and what I need help with:
Do I add any certain components to make a relay or is this something I buy already made and install? Can you recommend which components or relay I should use for this CD Player and direct me on the best way to install them? Or is this a huge undertaking and I should just remove the transistors only?
All help, as always, will be greatly appreciated!
Regards//Keith
So I can see the four (half round) Muting Transistors T109 - T112.
I understand I can clip or desolder them and don't need jumpers. Many say afterwards, they hear little or no noise and pops. Others say they hear different degrees of noise and pops with power off/on and changing CDs/tracks. All say the musical improvement is amazing! So I am moving forward.
It seems Muting relays are a superior solution. No pops or noise and the musical improvement is the same as removing the transistors. This is what I prefer but will settle (like it would be settling) for just removing the muting transistors.
So here is the question and what I need help with:
Do I add any certain components to make a relay or is this something I buy already made and install? Can you recommend which components or relay I should use for this CD Player and direct me on the best way to install them? Or is this a huge undertaking and I should just remove the transistors only?
All help, as always, will be greatly appreciated!
Regards//Keith
I hate to see you had no responce but anyone that dare answer could be faced trying to teach too much online.
You can use the transistor to drive the relay coil and the relay contacts would then short the signal to ground, direct if the output stage can handle that or through a resistor if it can't.
Google for basic electronics web sites and learn how transistors and relays work, from this knowlage you will get what you require.
You can use the transistor to drive the relay coil and the relay contacts would then short the signal to ground, direct if the output stage can handle that or through a resistor if it can't.
Google for basic electronics web sites and learn how transistors and relays work, from this knowlage you will get what you require.
First, you should find good relays i.e. Takamisava RY or NY series add to this control transistor and shund diode in parallel with relay coil. In internet there are many relay usage schematics.
Gentlemen,
I thank you both for responding. I was feeling like Tom Hanks in Cast Away.
Stones, that yellow road sign you have had me ROFL.
I have the unit apart now so I need to learn way too much way too fast. YIKES. I appreciate the info you posted to get me started. I am hoping for a link with a kit or something complete if there is such a thing!
S_volkovoy, Thanks for taking it a step further so I can use better search criteria when searching Google.
Fans....Keep those cards and letters coming! Thanks all!
Regards//Keith
I thank you both for responding. I was feeling like Tom Hanks in Cast Away.
Stones, that yellow road sign you have had me ROFL.
I have the unit apart now so I need to learn way too much way too fast. YIKES. I appreciate the info you posted to get me started. I am hoping for a link with a kit or something complete if there is such a thing!
S_volkovoy, Thanks for taking it a step further so I can use better search criteria when searching Google.
Fans....Keep those cards and letters coming! Thanks all!
Regards//Keith
Ok litle more help for you the link to the main page here is in the wiki on this site but for u help to learn 4 u
Its does not matter about relay quality so much as it will never be in the signal path (unless you are in mute, who cares at this point).
Its does not matter about relay quality so much as it will never be in the signal path (unless you are in mute, who cares at this point).
s_volkovoy said:
Philips/Marantz used in their old 14 bit players nice glass reed-relais with a coil around them for muting.
If you using ralay to short signal to ground you don't need a very high quality signal relay, small size and low cost is prefered.
s_volkovoy said:
But preferrably they must work fast, otherwise the extra work to add relais is for nothing. A muting circuit is to remove pops and clicks when cdp is turned off.
Usualy smaler relays works faster. And on more, MUTE circut switches with delays, so 0.1s - 0.3s for switshing should be enough.
Thanks everybody!
Looks like a reed relay and a diode for each channel will do it and reusing 2 of the four existing transistors. Now I have to figure out which reed relays and which diodes (hint, hint). I am not sure of the voltage I have available from the transistor and/or PCB and how to attach what to where. I will keep searching and reading. Most of what I find is so generalized, I am afraid to move. I haven't found anything on an exact situation like mine (output stage muting transistors converting to a muting relay on a CDPlayer and how to work with the PCB). Frustrating how much garbage you have to go through, even on Google.
I have to give you all a lot of credit for sticking to this and learning as much as you have! Have you ever seen the movie "The Matrix"? I wish I could get a couple of those downloads into my brain!
But Smith seems like a pain in the butt!
Regards//Keith
Looks like a reed relay and a diode for each channel will do it and reusing 2 of the four existing transistors. Now I have to figure out which reed relays and which diodes (hint, hint). I am not sure of the voltage I have available from the transistor and/or PCB and how to attach what to where. I will keep searching and reading. Most of what I find is so generalized, I am afraid to move. I haven't found anything on an exact situation like mine (output stage muting transistors converting to a muting relay on a CDPlayer and how to work with the PCB). Frustrating how much garbage you have to go through, even on Google.
I have to give you all a lot of credit for sticking to this and learning as much as you have! Have you ever seen the movie "The Matrix"? I wish I could get a couple of those downloads into my brain!
But Smith seems like a pain in the butt! Regards//Keith
s_volkovoy said:
Most CDP has digital and analog muting combined. Digital for silence between music searches and so on, analog on output for pops and clicks.
Hi Keith ,
see www.rayelectronics.nl
Marntz SA 8400 modifications ,
there you can see how the relays where implemented .
Greetings from Germany
Jürgen
see www.rayelectronics.nl
Marntz SA 8400 modifications ,
there you can see how the relays where implemented .
Greetings from Germany
Jürgen
Thanks Gentlemen. Looks like this is something that I can't mount on the PCB (unless I am really creative and I am nowhere near that stage).
Sometimes I think I am in over my head😱.... but that never stopped me before.🙄
Regards//Keith
Sometimes I think I am in over my head😱.... but that never stopped me before.🙄
Regards//Keith
KP11520 said:
Just keep going don't give in, nobody here will provide you with all the answers (there are so many that could), however they will guide you provided you are trying. If you have no wish to learn then paysome to do it for you as learning will be very rewarding but if you are trying just to save some money then you will soon learn that its more cost effective and usualy less fustrating to pay some one else, there is no reward to the latter methord.
So after all this time I did what I had the ability to do........ Wire cutters.
The Muting Transistors are gone! This was an agonizing decision because I was afraid to hurt my speakers (I listen loud sometimes). Fear is a terrible thing, it is even crippling sometimes.
What a difference and the pop is minimal to almost non-existent (even loud). So this can be a lesson for other newbies. For the Rotel RCD 965BX anyway, hack away! Or remove them nicely, it is worth it!
Now to find the best way to Bias to Class A the new OPA627AP op amps that replaced the NE5534s (very nice) is my next project. There is so much to learn at the same time to get to the point where I can confidently design, spec, build and install this circuit. This is where prayers help!
Thanks to all who helped me about the Muting questions!
Regards//Keith
The Muting Transistors are gone! This was an agonizing decision because I was afraid to hurt my speakers (I listen loud sometimes). Fear is a terrible thing, it is even crippling sometimes.
What a difference and the pop is minimal to almost non-existent (even loud). So this can be a lesson for other newbies. For the Rotel RCD 965BX anyway, hack away! Or remove them nicely, it is worth it!
Now to find the best way to Bias to Class A the new OPA627AP op amps that replaced the NE5534s (very nice) is my next project. There is so much to learn at the same time to get to the point where I can confidently design, spec, build and install this circuit. This is where prayers help!
Thanks to all who helped me about the Muting questions!
Regards//Keith
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