Hello, I've been lurking around this forum for some time, finally decided to register.
I have Nagra 4.2 lying around. The thing is, I don't have a PSU and it runs on 12 D-type cells, it would cost over 120 euro to buy them (I refuse to buy alkaline batteries, only rechargeables) + a charger.
Even though building my own PSU probably won't be any cheaper, at least it would increase the value of the recorder and it's in the DIY spirit.
It has "external PSU" 6-pin input:
Manual says:
The connections are as follows :
pin 1 battery negative
pin 2 chassis (positive)
pin 3 pilot playback output
pin 4 speed correction signal input
pin 5 negative external supply
pin 6 -10 stabilized output.
??? not sure what I should do with it...
Well, I know that the "pilot playback" is a 50 Hz signal, coming from the tape (it's a reference for playback speed).
Speed correction signal input is probably the signal, that is created by reading the "pilot" and then it increases or decreases the speed of the motor.
So for instance, if "pilot" coming from the tape is 49 Hz, speed correction signal from PSU would increase the speed of the motor.
As you can see, it's not just a typical PSU... and if I would just ignore these 2, then you would probably have no speed correction whatsoever.
It would be of course so much easier, if I could find the schematics for the ANT-3 (the PSU from Nagra)
There are of course other option: making a PSU that connects directly to the battery terminals, kinda amateur solution.
Or stacking a lot of AA batteries (I have a lot of them), and somehow connecting them to the recorder.
So what suggestions do you have? Am I way over my head?
I have Nagra 4.2 lying around. The thing is, I don't have a PSU and it runs on 12 D-type cells, it would cost over 120 euro to buy them (I refuse to buy alkaline batteries, only rechargeables) + a charger.
Even though building my own PSU probably won't be any cheaper, at least it would increase the value of the recorder and it's in the DIY spirit.
It has "external PSU" 6-pin input:
Manual says:
The connections are as follows :
pin 1 battery negative
pin 2 chassis (positive)
pin 3 pilot playback output
pin 4 speed correction signal input
pin 5 negative external supply
pin 6 -10 stabilized output.
??? not sure what I should do with it...
Well, I know that the "pilot playback" is a 50 Hz signal, coming from the tape (it's a reference for playback speed).
Speed correction signal input is probably the signal, that is created by reading the "pilot" and then it increases or decreases the speed of the motor.
So for instance, if "pilot" coming from the tape is 49 Hz, speed correction signal from PSU would increase the speed of the motor.
As you can see, it's not just a typical PSU... and if I would just ignore these 2, then you would probably have no speed correction whatsoever.
It would be of course so much easier, if I could find the schematics for the ANT-3 (the PSU from Nagra)
There are of course other option: making a PSU that connects directly to the battery terminals, kinda amateur solution.
Or stacking a lot of AA batteries (I have a lot of them), and somehow connecting them to the recorder.
So what suggestions do you have? Am I way over my head?