Hello,
Due to the fact that you can't buy new, at least half decent tape deck today and that my AKAI CS-F21 is having more and more problems do to it's age, I decided to build a tape deck mainly from old parts that I have laying around.
Tape deck from 2000 BMW 5 series radio made by Becker... soft buttons, plays A & B sides one way, motorised tape loading, photoresistor sensor on both reels...
I didn't do any measurements, but the sound is really nice, even with old beat-up tapes...
I solved the logic with Arduino and it does the job good... I still need to add A-B side logic and photoresistors logic...
For the preamp I will copy design from another BMW unit... 2000 BMW 7series navigation unit made by Phillips (basicly tape player, keypad and display in a package, amplifier and the main logic is seperate unit (in the trunk).
I will copy the design and build my own, because it just sounds so good, has Dolby NR B-C, norm and metal tape option, side A-B play, mute detection...
For now I"m testing with the original board, bricked to turn on without main unit (the one from the trunk).
Audio signal goes to the BA3430FS tape preamp, then to the HA12161FP Dolby IC and then to the TDA7053AT.
According to the datasheet TDA7053AT is an Dc volume controlled amplifier and I am wondering if I need it because I get good signal from DOLBY IC.
Can I take the signal from DOLBY IC? The new DIY unit will not have it's own amplifier, just line output at the back -possible short circuit scenario...
I was thinking about why Phillips added TDA at the end of signal chain and my assumptions are:
-Short protection
-Dc volume control
-Impedance matching (I don't have the main unit, so I can't confirm)
-Because the main unit was so far away in the trunk:
-amplification
-solution to ground loop noise problems as TDAs output is floating 5v above the power gnd
What do you think? Would you keep the TDA?
Thank you for help
Due to the fact that you can't buy new, at least half decent tape deck today and that my AKAI CS-F21 is having more and more problems do to it's age, I decided to build a tape deck mainly from old parts that I have laying around.
Tape deck from 2000 BMW 5 series radio made by Becker... soft buttons, plays A & B sides one way, motorised tape loading, photoresistor sensor on both reels...
I didn't do any measurements, but the sound is really nice, even with old beat-up tapes...
I solved the logic with Arduino and it does the job good... I still need to add A-B side logic and photoresistors logic...
For the preamp I will copy design from another BMW unit... 2000 BMW 7series navigation unit made by Phillips (basicly tape player, keypad and display in a package, amplifier and the main logic is seperate unit (in the trunk).
I will copy the design and build my own, because it just sounds so good, has Dolby NR B-C, norm and metal tape option, side A-B play, mute detection...
For now I"m testing with the original board, bricked to turn on without main unit (the one from the trunk).
Audio signal goes to the BA3430FS tape preamp, then to the HA12161FP Dolby IC and then to the TDA7053AT.
According to the datasheet TDA7053AT is an Dc volume controlled amplifier and I am wondering if I need it because I get good signal from DOLBY IC.
Can I take the signal from DOLBY IC? The new DIY unit will not have it's own amplifier, just line output at the back -possible short circuit scenario...
I was thinking about why Phillips added TDA at the end of signal chain and my assumptions are:
-Short protection
-Dc volume control
-Impedance matching (I don't have the main unit, so I can't confirm)
-Because the main unit was so far away in the trunk:
-amplification
-solution to ground loop noise problems as TDAs output is floating 5v above the power gnd
What do you think? Would you keep the TDA?
Thank you for help
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