no oversampling attenuated bridge TDA1540 TDA1541

NOS for TDA1540

As a replacement for the SAA7030 digital filter to operate the TDA1540 without oversampling. Replaces the digital filter on all CD models, even with upstream Sony chip or Philips SAA7000.

• 14-16 Bit NOS module 39�buy
no oversampling TDA1540

Installation
• desolder digital filter SAA7030
• Solder in NOS module instead
• no modification to the SAA7000 or Sony chip needed

For some 14-bit CD players of Japanese manufacture with the SAA7030, a further modification is necessary. The connection on the TDA1540 from pin 2 to the SAA7000 must be interrupted and connected to pin 7 of the NOS module. This affects models from Sanyo, Fisher, Akai, Mikro Seiki, Kyrocera and Marantz; e.g. CD 54, 74 and 84.

With the USB-in module, the NOS module is not required

metronom-module 2.0
OP-amp metronom

NOS for TDA1541

As a replacement for the digital filter SAA7220 to operate the TDA1541 without oversampling. Replaces the digital filter on all CD models and is used on all TDA1541 variants. In contrast to modules where you can choose between oversampling and non-oversampling, the digital filter, which would otherwise interfere with the digital power supply, is completely removed here. In addition, these switchable modules neither attenuate nor adjust the digital muting.

• NOS module 16 Bit 29�buy
no oversampling TDA1541

Installation
• desolder digital filter SAA7220
• Solder in NOS module instead

no oversampling TDA1541

In the units, there is a quartz clock, which is connected to two tracks - input and output (can be interchanged like a nonpolar cap). Often this quartz is connected to the digital filter SAA7220, the SAA7210/SAA7310 that sits in front of it then only needs one track. If the SAA7220 is removed, the quartz needs its two tracks to the SAA7210/SAA7310 - i.e. input and output from/to the quartz. Depending on the CD player and the position of the clock quartz, an additional cable connection between the quartz and the SAA7210/Saa7310 must be established:

Decoder SAA7210 (dil): pin18 - xtal2 - output / pin19 - xtal1 - input
Decoder SAA7310 (dil): pin18 - xtal2 - output / pin19 - xtal1 - input
Decoder SAA7310 (qfp): pin25 - xtal2 - output / pin26 - xtal1 - input

If the digital mute is to be used further, there must be a connection between the mute (nos bridge pin23) and the decoder.
Decoder 7210 (dil) - pin11
Decoder 7310 (dil) - pin11
Decoder 7310 (qfp) - pin18

A previous connection of this pin must then be removed

The digital output is shut down when the digital filter is removed.

With the USB-in module, the NOS module is not required