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.
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.
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. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. 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?
Preamplifier The preamplifier circuit consists of the input differential stage TR9, 10level shift stage TR13and output stage TR17, 18, Information including circuit diagrams and circuit parameters herein is for example only; it is not guaranteed for volume production. The bias current is several times higher than the recording current and also its frequency is higher. Andy aka k 10 Specifications and information herein are subject to. Description of Application Circuit.
I think somewhere around kHz makes the most sense. When designing equipment, adopt. 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. Since the output stage is of push-pull type, no remarkable drop in the output voltage occurs even at.
Anyway, it’s better to replace it with a ferrite erasing head because it demagnetizes the tape and prevents it from producing low-frequency saturation noise.
A single package contaning preamplifier, ALC circuit, power amplifier.
Or is it an IC that eludes me? Post as a guest Name. Upon using the technical information or products described herein, neither warranty nor license shall be granted. When designing equipment, refer to the “Delivery Specification” for the.
OK, this is how far I’ve got:
To verify symptoms and states that cannot be evaluated in an independent. The simpliest bias generator circuits contain one transistor, a transformer, and several capacitors and resistors. It looks like the circuit in page 3 will not be able to record anything in acceptable quality, but it can be a mistake in the datasheet itself. It’s likely just a permanent magnet daasheet saturates the magnetic tape in one direction. It’s a microcassette recorder. This is a screenshot of the datasheetpage 4.
Consider this circuit of the LA LA is Single-chip tape recoder audio system.
LA , Tube LA; Röhre LA ID, IC – Integrated
If you should intend to use our products for datasheft outside the standard applications of our. You need to know your recording head’s inductance, maximum recording current and maximum bias current to design the bias generator.
Given the rest of the Datasheet, I might be able to locate the point where this oscillator has to go. Specifications and information herein are subject to change without notice. An erasing head is commonly attached to the generator directly, and a secondary winding of the transformer is capacitively coupled to the recording amplifier output.
I’m not planning to make “professional” recordings on the tape recorder that will emerge at the end of the project. Check the type of your recorder erasing head. It might be as simple as mixing those two signals using resistors.
LA Datasheet(PDF) – Sanyo Semicon Device
I’ve done a little more research and I’ve added to my original post. The bottom line is try it and see and if it doesn’t work then no harm done.
I was thinking maybe there’s an IC for that available, but again, I’m not sure on that one. 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. Now, the oscillator needs to be a sine wave, but that’s pretty much all I know. Email Required, but never shown. Since the output stage is of push-pull type, no remarkable drop in the output voltage occurs even at low load impedances and the output can be connected direct to the ALC circuit and meter circuit.
It is possible that these probabilistic failures or. Sample Application Circuit 2: To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ‘ s products or equipment.
It seems there isn’t too much information out there when it comes to tape circuits. Any and all information described or contained herein are subject to change without notice due to.