Philips 304 mods. Tda1540 to Tda 1541 and DEM RECLOCKING - diyAudio
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Old 14th November 2010, 04:15 PM   #1
diyAudio Member
Join Date: Sep 2003
Location: Italy
Default Philips 304 mods. Tda1540 to Tda 1541 and DEM RECLOCKING

Hello to everyone.

I want to update my Philips 304 with a pair of TDA 1541.

I already found some threads here..but i could not find the aswer to all my i hope that someone will help me.

After switching the TDA1541 in simultaneous better to think about a reclock..? Or to use the diagram here enclosed?

I would like to use also the DEM reclock circuit proposed by it possible to use it with the TDA 1541 in Simultaneous mode..? If yes ...How?

THanks again.

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File Type: jpg TDA1540 NOS002.jpg (126.9 KB, 476 views)
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Old 15th November 2010, 08:08 PM   #2
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Join Date: Mar 2004
Location: Budapest, Hungary
I was who made the hand sketch on the left. In simultaneous mode it is important to reclock the LE (Latch Enable) signal, since it controls the conversion. The CLCF- is a pulse train, it can not be used for DEM. You can combine the I2S attenuator (it should work also for simultaneous signals) with my circuit. As for the DEM, I have no experience, but I think it is better to keep it below 1 MHz. Try a /4 or /8 divider from the master clock - or ask _ecdesigns_, he knows the TDA1541A in and out.
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Old 16th November 2010, 07:25 AM   #3
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Join Date: Sep 2003
Location: Italy
Thanks for your reply..

I'm thinking to prepare one pcb for the two tda1541, and one to replace the SAA7030 with your circuit buiklt in..

I will try to ask to EC design if he can help me about the DEM Reclock.

Thanks again.

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Old 18th November 2010, 09:44 AM   #4
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Join Date: Sep 2003
Location: Italy
HI Osi..

Did you get real benefits reclocking the LE? Did you compared the sound with or without LE reclock?

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