Hello.
This may or may not be a noobish question, but I figure a forum full of incredibly astute people could help me out.
I've got an application that requires a signal to pass into a recording head and onto a recording medium, then to be picked up by a playback head(s).
I worked out a layout to take the signal from the playback head, bring it back up to a normal level and equalize it based on the LA3161 chip, but I am not sure what needs to happen before the recording head. I'm assuming that signal needs to be boosted to get a good signal down on the recording medium, but I don't know how the best way to go about this would be. I'm guessing it needs to be boosted, like a preamp maybe, but it can't get distorted.
I was thinking something based upon the BS170 transistor, but something else would work also. The simpler, the better. It doesn't have to be anything high quality, but I don't want to much signal degradation.
Thanks for any ideas you guys have. I appreciate it.
Take care,
Matthew
This may or may not be a noobish question, but I figure a forum full of incredibly astute people could help me out.
I've got an application that requires a signal to pass into a recording head and onto a recording medium, then to be picked up by a playback head(s).
I worked out a layout to take the signal from the playback head, bring it back up to a normal level and equalize it based on the LA3161 chip, but I am not sure what needs to happen before the recording head. I'm assuming that signal needs to be boosted to get a good signal down on the recording medium, but I don't know how the best way to go about this would be. I'm guessing it needs to be boosted, like a preamp maybe, but it can't get distorted.
I was thinking something based upon the BS170 transistor, but something else would work also. The simpler, the better. It doesn't have to be anything high quality, but I don't want to much signal degradation.
Thanks for any ideas you guys have. I appreciate it.
Take care,
Matthew
Unfortuantly, I haven't been able to find much information on what comes before the recording head, so I just figured that you had to boost the signal enough.
I guess I have some more research to do... *sigh*
Is there anything I can look at for an example? Or any known layouts/schematics I can look at? It isn't going to be on tape, but it's a similar material.
Thanks for the heads up!
I guess I have some more research to do... *sigh*
Is there anything I can look at for an example? Or any known layouts/schematics I can look at? It isn't going to be on tape, but it's a similar material.
Thanks for the heads up!
As well as the requirement for bias, you need to provide a 'constant current' to the head - this is usually done very simply by feeding the head via a resistor.
I would suggest you check out old tape recorder circuits.
I would suggest you check out old tape recorder circuits.
Hi,
Surely there are some cassette recorders / playback on a chip ?
AFAIK DC to a tape recording or playback head is a very bad idea,
you may thinking of the erase head which I recall being DC current.
🙂/sreten.
Surely there are some cassette recorders / playback on a chip ?
AFAIK DC to a tape recording or playback head is a very bad idea,
you may thinking of the erase head which I recall being DC current.
🙂/sreten.
sreten said:
No, it uses the same high frequency as the bias (the same oscillator), but at far higher power to erase.
Some really cheap and nasty cassettes use a permanent magnet to erase the tape, and a crude (and poor) DC bias.
Thanks everybody, I will look around for some tape player schematics.
I'm going to have a running project consisting of different recording mediums and I wanted to start with a floppy disc. Trying different coatings, testing wear and tear. Then maybe try running tape around a drum like the echorecs. Possibly harddrive recording.
I know, it's not practical, but I'm not a practical person 😎
I'm going to have a running project consisting of different recording mediums and I wanted to start with a floppy disc. Trying different coatings, testing wear and tear. Then maybe try running tape around a drum like the echorecs. Possibly harddrive recording.
I know, it's not practical, but I'm not a practical person 😎
Here is some schematics
http://www.audioschematics.com/tapelist1.html#Studer
When recording on tape you also have an equalization curve, to get better s/n and dynamics. worth thinking about.
recording on discs.. I have an old Rex Rotary, which is a dictaphone, "phonograph" which is recording on magnetic discs.... it´s from the 60's... Pretty cool stuff 🙂
http://www.audioschematics.com/tapelist1.html#Studer
When recording on tape you also have an equalization curve, to get better s/n and dynamics. worth thinking about.
recording on discs.. I have an old Rex Rotary, which is a dictaphone, "phonograph" which is recording on magnetic discs.... it´s from the 60's... Pretty cool stuff 🙂
- Status
- Not open for further replies.