Thanks for the kind words Andrew, but as you can see some traces are not perfect, that shouldnt affect the sound.
I will try again today.
Regards
I have instaled another power supply with separated trafo for SAA7310GP. Sounds awesome!!!!
With ~12V in the input, it was easy to get +5V on the output, because SAA7310GP doesnt need so much current, something arround 50mA.
I really like how it sound. It improved the sound a lot, more natural highs and deeper and cleaner bass, abt middle range....have no words, its perfect!
With ~12V in the input, it was easy to get +5V on the output, because SAA7310GP doesnt need so much current, something arround 50mA.
I really like how it sound. It improved the sound a lot, more natural highs and deeper and cleaner bass, abt middle range....have no words, its perfect!
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Im astonished with the sound of this CD player, I have never heard something like this and i just cant stop to listen the music. I highly recomend the separated discrete power supply for SAA7310.
😉 😉 very nice work!
This is a very good mod along with the psu for the 7220.
Have you got the RAM chip on the same low noise regulator?
Also what regulation are you running on the servo section? You can see why space becomes and issue!!! 😉
Thanks
We know it doesnt look nice 🙂, but when ill do all mods i will put it in a nice box and new PCB's
For the RAM i have ordinary cheap regulator at the moment, but ill design one bigger PSU PCB for all chips.
Servo is also on ordinary regulator(can you suggest some PSU?)
Im very currious if discrete PSU will improve the sound of the analog stage.
And, yes i need more space, at the moment i have 5 trafo's: one for the analog output, one for the TDA1541, one for the SAA7220, one for the SAA7310, the fifth one is for the rest 😉
No NOS mode still and still with LM833 on the output, I will leave that for the end.
ABT NOS im not so sure if i want to try that mode.
Goran Hi
Nice job you did there !
I tried NOS and went back to the SAA7220.
Some like it very much - it did not please me so much after a while.
Are you using the new boards to re power all chips then ? ( 7310 / 7220 / ram )
I'm sure it will sound very nice indeed.
I can't see a clock in there yet - is it underneath a board ?
If you have not clocked it yet you have another big jump in performance to come. You can clock the 7310, 7220 and the dac chip separately and quite cheaply using a simple yet excellent clock from E BAY.
I did this already and the jump was bigger than I could have expected.
I can show you the clock I mean if you need to see it
Andrew
Nice job you did there !
I tried NOS and went back to the SAA7220.
Some like it very much - it did not please me so much after a while.
Are you using the new boards to re power all chips then ? ( 7310 / 7220 / ram )
I'm sure it will sound very nice indeed.
I can't see a clock in there yet - is it underneath a board ?
If you have not clocked it yet you have another big jump in performance to come. You can clock the 7310, 7220 and the dac chip separately and quite cheaply using a simple yet excellent clock from E BAY.
I did this already and the jump was bigger than I could have expected.
I can show you the clock I mean if you need to see it
Andrew
Thanks Andrew,
Yes i will use one big PSU board for everything. It will save me a lot of space. Also, ill put the transformators in a separate box, and i would like to follow what UV101 did with the bank of cap's.
I have to say one more time, this saa7310 mode was the right thing, sounds great.
I have not done any clock mode yet, first i prefer to finish the PSU modes,
NOS i have never tried, i think the saa7220 is on the right place in this chain. It just need good PSU.
How many boards you will need? I can feel you'll want more then one 🙂
Please show me the clock, i have something like data of modes for CD40 so it will feet perfectly in my collection.
Regards
Goran
Hi Goran
I never thought about how many boards !!
erm... 25 OK ?😀 hahahahah
It's a joke Goran - relax.
I have Teddy regs built for the RAM and 7310 ( not fitted yet )
so my main worry was the 7220 - this is why I was interested in your board.
It is said that this chip can eat 180 - 200 ma and of course is the ' BAD ' chip for noise and spoiling TDA 1541 sound.
If you think your board is good for 7310 also then I'd like 2 - is this possible ?
The pics show the red Vintage Audio lab ( E Bay ) clock which will give you separate 11.289 mhz, 5.6mhz and 2.8 mhz clock feed. The pic of the TDA 1541 shows where the wires were connected to feed 11.289 and 5.6 direct to the chip. The 7220 has it's own 11.289 and the 7310 has it's own 11.289 also - I had to cut some traces on the mainboard to make this work.
The player is amazing compared to how it started it's life.
I's not the greatest clock in the world however but it provided an amazing upgrade over the standard crystal - anything will !!!
I am at the moment running the 7220 from it's own transformer, bridge rectifier and large capacitor into a 7805 ( not shown in the pic ) but a considerable improvement was gained. Your board will provide a further improvement I am sure.
Hope this helps in some way - can't wait to try your boards !!
Andrew
I never thought about how many boards !!
erm... 25 OK ?😀 hahahahah
It's a joke Goran - relax.
I have Teddy regs built for the RAM and 7310 ( not fitted yet )
so my main worry was the 7220 - this is why I was interested in your board.
It is said that this chip can eat 180 - 200 ma and of course is the ' BAD ' chip for noise and spoiling TDA 1541 sound.
If you think your board is good for 7310 also then I'd like 2 - is this possible ?
The pics show the red Vintage Audio lab ( E Bay ) clock which will give you separate 11.289 mhz, 5.6mhz and 2.8 mhz clock feed. The pic of the TDA 1541 shows where the wires were connected to feed 11.289 and 5.6 direct to the chip. The 7220 has it's own 11.289 and the 7310 has it's own 11.289 also - I had to cut some traces on the mainboard to make this work.
The player is amazing compared to how it started it's life.
I's not the greatest clock in the world however but it provided an amazing upgrade over the standard crystal - anything will !!!
I am at the moment running the 7220 from it's own transformer, bridge rectifier and large capacitor into a 7805 ( not shown in the pic ) but a considerable improvement was gained. Your board will provide a further improvement I am sure.
Hope this helps in some way - can't wait to try your boards !!
Andrew
Attachments
By the way - the interconnects shown are crap test leads - not the ones i used in the main system.
I have two systems - one crap and one nice.
I test all my experiments in the crap system in case I blow something up, burn out my speaker voice coils, create explosions or have electrocution session 😀
I used to electrocute myself all the time - it's how I learned !!
I came to enjoy it in the end - I did it so often.
Now I know I'm a qualified electronics engineer because I have not done this for at least 6 months and....I've been dabbling with valves as a buffer.
Hope everyone is impressed !!
I was pretty scared was I when I first switched that on....400 volts dc.... holy sh..
Other readers of this may be laughing - I don't care !
I'm a Piano playing Salesman by day....electronic bomb maker by night !!
Andrew
I have two systems - one crap and one nice.
I test all my experiments in the crap system in case I blow something up, burn out my speaker voice coils, create explosions or have electrocution session 😀
I used to electrocute myself all the time - it's how I learned !!
I came to enjoy it in the end - I did it so often.
Now I know I'm a qualified electronics engineer because I have not done this for at least 6 months and....I've been dabbling with valves as a buffer.
Hope everyone is impressed !!
I was pretty scared was I when I first switched that on....400 volts dc.... holy sh..
Other readers of this may be laughing - I don't care !
I'm a Piano playing Salesman by day....electronic bomb maker by night !!
Andrew
Goran Hi
The white boards pic looks very professional.... again😉
The 2030 boards you made - will they take LM 1875 ?
Andrew
The white boards pic looks very professional.... again😉
The 2030 boards you made - will they take LM 1875 ?
Andrew
Yes SAA7220 needs more current, its not a problem at all ill send you 2 PCB's, just i have to make the second one. I have printed severall of them on a paper it just need to be copied on the board, ill do it today.
Tell me more abt Teddy regs's please. And what is the price of the clock you have?
regards
Goran
As i can see from the datasheet, yes they can.
Why would you like the boards of this kind? I make them for the ultrasound cleaner project, but im still looking for transducers and a container.
Andrew,
I PROMISSE Ill send the 2 PCB's this week. Im embarrassed. Sorry man.
Can you tell me what decoupling cap's will feet the best for the digital stages? Oscon's?
Where I can find the real ones?
I PROMISSE Ill send the 2 PCB's this week. Im embarrassed. Sorry man.
Can you tell me what decoupling cap's will feet the best for the digital stages? Oscon's?
Where I can find the real ones?
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About clocks. I know some who build very good clocks.
The price not bad compare to LC and Kwak. Quality is excellent.
Flickr: Depner Audio's Photostream
The clock is a blue board on the left top in the CD.
The price not bad compare to LC and Kwak. Quality is excellent.
Flickr: Depner Audio's Photostream
The clock is a blue board on the left top in the CD.
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Hi Goran
Oscons are good, SEPC version is better still on TDA.
The ones you can see in the pic are Oscon SEPC 470 uf - 6 V
The clock is £ 27.00 ish - very cheap for what it does.
Attached pic is a teddy reg - there's loads of info on the site about this.
It kind of turns a standard 7805 ( and others ) into a low noise replacement.
Everyone who made them said they were a big improvement on a standard regulator.
I have more information I can send if this is of interest.
Danico - any sign of the caps yet ?
Andrew
Oscons are good, SEPC version is better still on TDA.
The ones you can see in the pic are Oscon SEPC 470 uf - 6 V
The clock is £ 27.00 ish - very cheap for what it does.
Attached pic is a teddy reg - there's loads of info on the site about this.
It kind of turns a standard 7805 ( and others ) into a low noise replacement.
Everyone who made them said they were a big improvement on a standard regulator.
I have more information I can send if this is of interest.
Danico - any sign of the caps yet ?
Andrew
Attachments
Here's a better pic.
There's a BC 547, Oscon cap, Tantalum cap and a resistor plus the +5v reg.
Easy drop in replacement.
No good for 7220 of course - but good for 50 ma MAX - probably with a heatsink
squeezed in.
With some changes to cap and resistor values it's performance can be improved and also I think BD139 based designs exist too.
Don't worry about delays with the boards - it's no problem.
Andrew
There's a BC 547, Oscon cap, Tantalum cap and a resistor plus the +5v reg.
Easy drop in replacement.
No good for 7220 of course - but good for 50 ma MAX - probably with a heatsink
squeezed in.
With some changes to cap and resistor values it's performance can be improved and also I think BD139 based designs exist too.
Don't worry about delays with the boards - it's no problem.
Andrew
Attachments
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