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nos bridge for TDA1540

As a replacement for the digital filter SAA7030 to operate the TDA1540 without oversampling. The digital signals are attenuated in the module and adapted to the TDA1540.

•  14 Bit attenuated nos bridge S-type 39buy
Replaces the digital filter on all models that have an SAA7000 or Sony receiver chip upstream, such as Marantz CD73, Philips CD303, Studer A725 and many others.
no oversampling TDA1540

•  attenuated nos bridge 14 Bit 25buy
Replaces the digital filter on all models that have an SAA7000 chip upstream.
no oversampling TDA1540

Installation
•  Digitalfilter SAA7030 desolder
•  attenuated nos bridge solder in

The further steps are omitted with the use of the attenuated nos bridge S-type.

no oversampling TDA1540

•  disconnect SAA7000 pin16 from the trace
•  connect pin16 with 1kOhm resistor to pin18

For 14bit CD players of Japanese manufacture with the SAA7030, another change is necessary. The connection of the TDA1540 at pin2 to the SAA7000 must be interrupted and pin2 of the TDA1540 must be connected to pin7 of the NOS bridge. 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 bridge is not required



metronom-module 2.0
OP-amp metronom

nos bridge for TDA1541

As a replacement for the digital filter SAA7220 to operate the TDA1541 without oversampling. The digital signals are attenuated in the module and adapted to the TDA1541.

•  attenuated nos bridge 16 Bit 22buy
no oversampling TDA1541
Installation
•  Digitalfilter SAA7220 desolder
•  attenuated nos bridge solder in

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 bridge is not required