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Old 17th February 2003, 05:06 PM   #1
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Default Building Aleph P clone (still a mistery)

Hi there,

I did some research on the Aleph P.
I found that out that the microcontroller is the hardest part.
The microcontroller controls the volume and input selection.
By optical sensors, the microcontroller can be adjusted.
It's like (I think) how a computer-mouse works.
If we could just replace this 87C750 (80C752) from Philips for a Pic programmable IC. I have done a search and I think it is possible with this kit:
http://www.velleman.be/downloads/0/Manual_K8045.pdf
http://www.velleman.be/Product.asp?lan=1&id=349182
It is actually an LCD controller, but if we program it for other use such as volume-control or input-selector.
It's like an cheap Pic-programmer.
I've seen other volume controllers on this site, my thought about that is, 8 steps volume.. that isn't a lott.
If it works, you could just buy the PCB from Kristijan and implement it.
The other IC's like 74HC573 are buffer IC's wich shouldn't be a problem.
Tell me if I'm wrong.

Greetzzz,
Remco Blankesteijn
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Old 17th February 2003, 05:50 PM   #2
Mark Kravchenko
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Default 8 bit Volume control Without Micro

I think that if you go to the volume control thread in the Pass Labs section you will find that the 8 bit dac version of the volume control actually has 256 steps. This might be what you are looking for.

Mark
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Old 17th February 2003, 08:39 PM   #3
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Yes, you can have more than one resistor "switched" at a time, and in parallel.
Something like this perhaps, unless I got the LSB/MSB backwards.

Decimal Binary Resistance (ohms)
1 1 0 0 0 0 0 0 0 8,060.0000
2 0 1 0 0 0 0 0 0 4,020.0000
3 1 1 0 0 0 0 0 0 2,682.2185
4 0 0 1 0 0 0 0 0 2,000.0000
5 1 0 1 0 0 0 0 0 1,602.3857
6 0 1 1 0 0 0 0 0 1,335.5482
7 1 1 1 0 0 0 0 0 1,145.7041
8 0 0 0 1 0 0 0 0 1,000.0000
9 1 0 0 1 0 0 0 0 889.6247
10 0 1 0 1 0 0 0 0 800.7968
11 1 1 0 1 0 0 0 0 728.4246
12 0 0 1 1 0 0 0 0 666.6667
13 1 0 1 1 0 0 0 0 615.7372
14 0 1 1 1 0 0 0 0 571.8350
15 1 1 1 1 0 0 0 0 533.9525
16 0 0 0 0 1 0 0 0 499.0000
(...)
233 1 0 0 1 0 1 1 1 34.0602
234 0 1 0 1 0 1 1 1 33.9162
235 1 1 0 1 0 1 1 1 33.7741
236 0 0 1 1 0 1 1 1 33.6296
237 1 0 1 1 0 1 1 1 33.4899
238 0 1 1 1 0 1 1 1 33.3506
239 1 1 1 1 0 1 1 1 33.2132
240 0 0 0 0 1 1 1 1 33.0691
241 1 0 0 0 1 1 1 1 32.9340
242 0 1 0 0 1 1 1 1 32.7993
243 1 1 0 0 1 1 1 1 32.6664
244 0 0 1 0 1 1 1 1 32.5312
245 1 0 1 0 1 1 1 1 32.4005
246 0 1 1 0 1 1 1 1 32.2701
247 1 1 1 0 1 1 1 1 32.1414
248 0 0 0 1 1 1 1 1 32.0106
249 1 0 0 1 1 1 1 1 31.8839
250 0 1 0 1 1 1 1 1 31.7577
251 1 1 0 1 1 1 1 1 31.6331
252 0 0 1 1 1 1 1 1 31.5063
253 1 0 1 1 1 1 1 1 31.3836
254 0 1 1 1 1 1 1 1 31.2613
255 1 1 1 1 1 1 1 1 31.1405
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Old 17th February 2003, 10:12 PM   #4
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Hi,

Ok, but then how to implement a remote control?
With a Pic it is easier I think.
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Old 17th February 2003, 10:30 PM   #5
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Yes, a microcontroller of some kind, an IR detector, and software to glue it together. A display if you want that also.
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Old 17th February 2003, 10:33 PM   #6
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I made the ADC0804 version of this. It is quite easy to build and works good. Only it has one disadvantage, a lot of switching noise when you tune the volume. This is because during tuning there a moments with no realis closed then some closed etc. If you use the MC, this noise can be avoided by switching a relais closed that should be closed according to the value you read at the volume controll (optical, AD input etc) , wait a moment, than open a relais that should be opened and so on. So the switching isn´t that hard. (sorry language skills missing to use better words here)

btw. who needs remote? - sure this task is easy with a MC
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Old 18th February 2003, 08:02 AM   #7
Klaus is offline Klaus  Germany
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Default solution w/o SW must

I also - like Till - combined P1.0 with P1.7. I use from P1.0 the ADC0804 volume controll, but with 7bit. Good voltage supply for the ADC is a must. No SW programming necessary. The inputs are switched by simple mechanical 6 step-4 contact Elna-switch by hand. For the remote controll of volume, gain level (+6dB), inverse polarity and mute I found a discontinued old remote controller IC and build a simple device added by flipflops for switching function on/off. http://leute.server.de/peichl/fernbed/fernbed.htm (sorry, it is in German, but the schematic is clear...). Alternative solution would have been to buy a IR-remote controll system from e.g. Alps http://www.schuro.de/preisl-fernb.htm for a quite reasonable price of 85€. So, no SW at all, plug&play...

regards

Klaus
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Old 20th February 2003, 10:35 PM   #8
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Goedenavond Remco,

I'm building the BoSoZ. A remote is something i like very much. Therefore i'm puzzling how to use an Atmel ucontroller. A friend of mine started working with those things and he's pretty enthousiast about them.
It should be possible to use one for source selection and volume control. Then you wouldn't need an A/D convertor.

Last thing the atmel should do is controlling the red LED matrix display. (i like the Mark Levison look !!!)

Take a look at this . That's the goal

Grtz,
Nick
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Old 20th February 2003, 11:05 PM   #9
mlloyd1 is offline mlloyd1  United States
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Default pic based remote control solution ...

I like this one. It is flexible, easy to use and works well. It's not very expensive and I happen to have a few extra Sony universal remotes looking to be useful.

Of course, if you are one of those folks that likes doing your own coding, you may be disappointed

http://www.rentron.com/remote_control/IR-D14.htm

mlloyd1
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Old 21st February 2003, 07:41 AM   #10
gogo is offline gogo  Bulgaria
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>Hi,
>Ok, but then how to implement a remote control?
>With a Pic it is easier I think.

I will use ADC0804 (8 bit) with motorised potentiometer (from old receiver) and with old remote controll driving the pot. Think that this will be easyest way....
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