I tried again with the 5V supply, this time connecting it to point 5A on the pdf. I cut the trace that goes between that point and the cap near to the inductor. But still no luck - the disc continued to spin without reading the TOC.
On wiring 5A to 5B and reverting to just the 8V supply normal operation returned.
What am I doing wrong - any ideas?
On wiring 5A to 5B and reverting to just the 8V supply normal operation returned.
What am I doing wrong - any ideas?
Suggested a while back, but there are reset lines in the driver chip that my need the transistor in the regulator circuit in order to function correctly. If you have a scope, you might look at those two lines to see if they behave the same with the differing power situations.
Pins 16 and 17 on the LA6541.
Pins 16 and 17 on the LA6541.
jonners said:
Thanks John
I was going to try ordering through Percy Audio (not sure how speedy their service is) and get the remaining parts from Peter.
I am new to electronics, so can you answer this? If a suggested capacitor is for example 4.7/50v, will a 4.7/100v be OK as a substitute? I am assuming the voltage is a maximum and does not affect the sound.
Richard
In general substituting higher voltage caps is ok, however physically they may not fit the available space. (In the old days it was recommended that much higher voltage rated caps than called for in a particular application not be used due to deterioration in the dielectric at lower than design voltages, causing a reduction in capacitance, etc.. - this no longer appears to be a problem with modern caps, and today generally the higher voltage rated parts have better DA/DF performance than comparable lower voltage parts.)
I have been dealing with Michael Percy for over 20yrs now and he is both prompt and reliable.
On an unrelated topic make sure that the platter and clamp assembly on your 'clone runs flat and true as the increase servo activity if this is not the case seems to ruin the sound. I have one platter that is nearly perfectly flat and one that isn't and I thought I could hear a definite difference. Should yours not run true find one off of an old laptop cdrom drive as discussed earlier in the thread.
I have been dealing with Michael Percy for over 20yrs now and he is both prompt and reliable.
On an unrelated topic make sure that the platter and clamp assembly on your 'clone runs flat and true as the increase servo activity if this is not the case seems to ruin the sound. I have one platter that is nearly perfectly flat and one that isn't and I thought I could hear a definite difference. Should yours not run true find one off of an old laptop cdrom drive as discussed earlier in the thread.
A little clarification please regarding digital output from the transport. I've read this thread at least 3 times but I'm still a bit confused.
I see from Peter's pictures that he took D-out from the opposite side of the pcb from where D-out is shown over by the TOC switch. I assume this is because of the hole that he drilled to get direct access to the pin. Are most folks using D-out for the location of the voltage divider?
I see from Peter's pictures that he took D-out from the opposite side of the pcb from where D-out is shown over by the TOC switch. I assume this is because of the hole that he drilled to get direct access to the pin. Are most folks using D-out for the location of the voltage divider?
Hi Audio1st...
How did you go about...mounting the clamp..
Pitty you did 2 mods at the same time...anyway I guess both for the better...
I am still awaiting my 2nd clamp (first one was off-center) and am planning to try to mount it without force.....
Did you measure in some sort of way...
Today I finished the sides and the top of the piTbull psu-box..
I used 2 mm copper.....
And hey my regulators arrived today....heating up...
How did you go about...mounting the clamp..
Pitty you did 2 mods at the same time...anyway I guess both for the better...
I am still awaiting my 2nd clamp (first one was off-center) and am planning to try to mount it without force.....
Did you measure in some sort of way...
Today I finished the sides and the top of the piTbull psu-box..
I used 2 mm copper.....
And hey my regulators arrived today....heating up...
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