Audio signal level on Spectrum
ZXNet echo conference «hardware.zx»
Hello, maximk
"the beeper signal is mixed in" And what does this change?
TTL he is...
Hello, maximk
So there is TTL and then how will it come out? :)
Hello, maximk
max> This means the output from the beeper (external, i.e. to the socket) and/or from AY.
max> That is. do our models have any standard on this topic or who
max> did you do it the way you wanted? I want the level to be like the exit
max> "spekears" on PC, i.e. so that the average headphones work without
max> additional amplifier, but when connecting active speakers there were no
max> distortion. Now, according to my subjective feelings, it is somewhat lower, and
max> As for the output resistance, I don’t know at all.
max>
For output - up to 1 volt, approximately. Not for Spectrum, but for audio equipment
in general.
Hello ASDT
nothing. At least in profi3.2 the beeper signal is mixed in left and right
AY, and those, in turn, are also output through an RC chain.
Hello, All
This means the output from the beeper (external, i.e. to the socket) and/or from AY. Those. yes
Do our models have any standard on this topic or who wanted it the way they wanted?
did you do? I would like the level to be like the "spekears" output on PC, i.e. to
medium headphones worked without an additional amplifier, and when connected
there was no distortion from the active speakers. Now, according to my subjective feelings, he
somewhat lower, but as for the output resistance, I don’t know at all.
If you need to add some additional amplifier to the spec, then I would like
I wish his diagram might have appeared in some magazines.
(If the model is important, then I have profi3.2.)
Hello fk0
Damn, guys, don't take me for a complete lame, but I'm really not good at
gland. Regarding TTL; A; Aren't AY's outputs analogue? This is the first thing.
Secondly, the fact that level 1 V is understandable, but I am interested in the practical side.
Roughly speaking, the question is this: should I output what already exists to a 3.5mm socket?
or install an additional amplifier? If it's an amplifier, then I'd like a circuit diagram. I
I'm leaning towards the second option, because if I connect headphones now -
the sound is too quiet.
After all, the spec was created to connect to the audio path of a TV, and this is more likely
closer to line-out in level, but I need a more different output. Plus a day off
The resistance, as I understand it, is different on the speaker and line-out.
Hello, maximk
The output is high-impedance, it will go to active speakers, but you need an amplifier for headphones. yes
such a microcircuit, KA2209 (and a bunch of analogues) - see ZX-Hard either in N1 or N2.
buy the newspaper itself on zx.da.ru
Hello Ronin
The output stage circuit can be seen in the TurboSound circuit;
http://www.nedopc.com/TURBOSOUND/ts_b_sch.png;
It should be normal for both active acoustics and earphones ;)
Hello jdigreze
don’t let a person rummage around in the press;) otherwise all the ready-made links are on the net.
Hello Ronin
Almost any TDA can be used as amplifiers. for example on
memory TDA2822 - stereo 1W, power supply +5; TDA2003 - mono at 10W; TDA2004/2005 -
stereo at 10W, TDA2050 - mono at 32W; TDA7293 - 100W mono :)
I went to the local radio market and looked at what the sellers said were amplifiers and then
I used http://www.datasheetcatalog.com.
Alternative
http://www.datasheetcatalog.net/cgi-bin/helo.pl?field=Nume&type=C&text=audio+am
expander&producedby=
Here you will find a bunch of types of amplifiers on various microcircuits. You will need something
which operates from 5/12Volt and has a sensitivity of about 0.5-1Volt. These
data in the first and second tables Supply voltage min/max - supply range
voltage, Input sensitivity - sensitivity - usually in millivolts
I like the ones that are easily accessible better, TDA20XX, TDA28XX
Hello jdigreze
jdi> The output stage circuit can be seen in the TurboSound circuit'
By the way, I declare once again that connecting emergency low-impedance loads to the vehicle
(headphones) releases the manufacturer from obligations regarding performance characteristics (distortion
for example) and from warranty obligations (if the Oushka crashes). For
Power amplifiers should use chips specialized for this purpose.
Bag> TDA2822 - stereo 1W
They seem to be analogues with KA2209, if I’m not confusing something.
it's best for headphones.
Hello Ronin
amplifier with mikruhoy KA2209, simple as hell, in zx-ferrum I even wore a scarf
printed drive, which can be made with a cutter in half an hour, only on
the headphones will need to be cut to 100 ohms through the cutter or to taste 8-), number
I don't remember ferrum. The mikruha costs about 15 rubles