LA is Single-chip tape recoder audio system. A single package contaning preamplifier, ALC circuit, power amplifier. Features. • Preamplifier with high gain, . Tube LA or Röhre LA ID, IC – Integrated Circuit, Wires and Power/Output shown. Radio tubes are LA Sanyo datasheet. Günther Stabe. LA Hoja de datos, LA datasheet, Sanyo Semicon Device – Single-Chip Tape Recorder Audio System, Hoja Técnica, LA pdf, dataark, wiki, arduino.

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No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage datasheeh retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.

Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design.

audio – AC bias circuit for a tape recorder – Electrical Engineering Stack Exchange

It seems there isn’t too much information out there when it comes to tape circuits. It’s a microcassette recorder.

This catalog provides information as of August, Email Required, but never shown. Information including circuit diagrams and circuit parameters herein is for example only; it is not guaranteed. Upon using the technical information or products described herein, neither warranty nor license shall be granted. It means you need a separate bias generator anyway.

I just want a proof of concept type of thing. Andy aka k 10 On the other hand, it may not work because the “simple” resistor circuit above may cause the amplifier producing the regular record signal the audio to clip and distort. The products mentioned herein shall not be intended for use for any “special application” medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.


I don’t know which peak-to-peak level, and I’m not entirely sure what frequency. Check the type of your recorder erasing head. Consider this circuit of the LA But how exactly do I build this datashfet

It seems to be quite difficult the way you describe it. No part of this publication may be datahseet or transmitted in any form or by any means, electronic or. On page 3 of the datasheet, the bias oscillator is missing, is that DC biased then there’s just a filter with unmarked cap and resistor?

The bias current is several times higher than the recording current and also its frequency is higher. I think somewhere around kHz makes the most sense. Since the output stage is of push-pull type, no dataasheet drop in the output voltage occurs even at low load impedances and the output can be connected datashewt to the ALC circuit and meter circuit.

I found some schematics for AC bias circuits, but they were all very different, and I’m not sure which one is suitable for tape recorders. I was thinking using a 70kHz oscillator, and adding it to the signal somehow before the DC bias, as in, removing the DC bias parts.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. It’s likely just a permanent magnet that saturates the magnetic tape in one direction.

The bottom line is try it and see and if it doesn’t work then no harm done. I’d like the most simple solution, which could be easily put on a daughter board and hidden in the tape recorder. An Example of Printed Board Cu-foiled side.


If there is no consultation or inquiry before the intended use, our customer shall be solely responsible dataasheet the use. When designing equipment, adopt. Now, the oscillator needs to be a sine wave, but that’s pretty much all I know. This is a screenshot of the datasheetpage 4.

When designing equipment, refer to the “Delivery Specification” for the. Information including circuit diagrams adtasheet circuit parameters herein is for example only; it is not guaranteed for volume production.

OK, this is how far I’ve got:

Preamplifier The preamplifier circuit consists of the input differential stage TR9, 10level shift stage TR13and output stage TR17, 18, Sign up using Facebook.

The preamplifier circuit consists of the input differential stage TR9, 10level shift stage TR13and output stage. I’ve done a little more research and I’ve added to my original post.

It might be as simple as mixing those two signals lw4160 resistors.

LA Hoja de datos ( Datasheet PDF ) – Single-Chip Tape Recorder Audio System

Now as you can see in the lower left corner, there is a device “Bias OSC”. Specifications and information herein are subject to. VG pre 20 log Z1 dB. Sample Application Circuit 2: You may have to use a transformer to couple the two signals together and this still may cause the regular amplifier some issues. It might be no more difficult than making a 70kHz signal and adding it to your “normal” record signal that feeds the tape head.

Maybe you can help though?