DUAL EQULIAZER AMPLIFIER. WITH ALC. DESCRIPTION. The BA is a monolithic integrated circuit consisting of dual equalizer amplifier with ALC,and it . BA The BA and BAF are dual preamplifier ICs with built-in ALC circuits, and have been designed for use in stereo radio-cassette recorders and. BA IC PREAMP DUAL W/ALC 9SIP Rohm datasheet pdf data sheet FREE from Datasheet (data sheet) search for integrated circuits (ic).
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How should I connect it? It’s a major feature of this chip, and I guess it’s assumed you know what it is as you chose the chip. Notice how the amplifier is used for amplifying for both recording and playback.
The same tape head is also used for both functions. ALC automatic level control was an dafasheet function in tape recorders, as the signal datashert to be the right level, strong enough to overcome noise but not too high to cause saturation.
A variable-gain amplifier is a bit tricky to do without distortion, so having it integrated into the preamplifier was a convenience for the system designer. I don’t know what you plan to do with the part, but an obvious choice would be an audio compressor. It won’t be super high-fidelity, but maybe good enough for a guitar stomp box. If they talk all the time about ALC, and fail to explain what it is, all I can say then is that the datasheet stinks.
The application example on page 3 gives us some idea. The ALC signal is taken from the output, via a diode and an external capacitor. That means it’s a peak detector, whose level is then used to control datasyeet amplifier’s amplification.
So that looks very much like Automatic Level Control, though Audio Limiter Control is a close relative, if not exactly the same. There’s a block diagram that looks like the ALC picks up the output signal and uses it to adjust integrated potentiometers at the input pins of the forward path.
Dual Preamplifier With Alc
It looks like the IC is intended to be used with cassette tape recorders. Cheapo recorders often don’t have a potentiometer where one can set the recording level. Instead, an circuit tries to adjust the level of the signal that is to be recorded such that it is neither too silent and vanishes in the tape noise, nor too loud so it would cause tape saturation distortion.
Home Questions Tags Users Unanswered. What is Ba3380 on a preamp? I have looked for meanings of ALC online, and I have found 2 possible meanings that would fit this device: If you look at the datasheet, there is an example application circuit: I don’t see that in the datasheet I linked to above – you must have a different one. Fancy posting a link to it?
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It is the ROHM datasheet form alldatasheet. That’s the one I linked to – it has no circuit in it.
Don’t you just hate it when they do that? Not really helpful in answering the question.
BA 데이터시트(PDF) – Rohm
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