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Old 27th August 2002, 01:56 PM   #1
palesha is offline palesha  India
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Default Remote Control

I wish to add remote control to my amp circuit. I think only three controls will be ok. Volume, on-off and mute. Anybody has made or tried this type of circuit? Readymade kits are available or not?
Mahendra Palesha
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Old 27th August 2002, 02:19 PM   #2
Freddie is offline Freddie  Sweden
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I'm about to start building a simple remote control/receiver with the Holtek HT12-D/E chips.

/Freddie
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Old 27th August 2002, 08:22 PM   #3
trwh is offline trwh  United Kingdom
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Hi palesha

I really wanted a remote volume control on my Elliott P88 preamp; getting up to change the volume when you've just got comfy is a real pain. A motorised potentiometer seemed an obvious, sonically transparent, and aesthetically pleasing control method. However, I couldn't find any suitable control circuits on the net, and only one somewhat overpriced kit (100USD from Michael Percy audio, not including the pot).

I ended pinching the receiver circuitry schematic from the service manual of an amp made by the same manufacturer as my CD player. This allows me to use the volume buttons on my CD player remote with my preamp. I would post the schematic, but it is based around a PIC, and you would need the same one as used in the amp (I was able to scrounge one as a "spare"). Also, it's a commercial circuit.

Anyway, just a hint!
Tim.
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Old 27th August 2002, 09:12 PM   #4
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Hi.

Has anyone tried the kit from Michael Percy. Litle pricey but I guess good enuf. It is on the end of the Catalog.





Trigon.
Michael Percy
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Old 27th August 2002, 09:16 PM   #5
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Here it is.

Trigon.
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File Type: jpg remotemp.jpg (13.6 KB, 971 views)
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Old 28th August 2002, 05:42 AM   #6
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Hi,

Guess y'r not into digital stuff ???
Otherwise you could make a remote receiver with a PIC16F84 based on the RC5 codes.

I did that and this works perfect.


grtz

Simon
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Old 28th August 2002, 04:24 PM   #7
palesha is offline palesha  India
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Hi Blu_line,
Nice to hear about solution from u. Please give us details as we r new to digital. Hoping of ur kind co-operation in the matter.
Mahendra Palesha
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Old 28th August 2002, 06:36 PM   #8
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I will try to make a short description tomorrow.
btw there is a lot of good DIY RC5 stuff on the net.
I took my prefered micro-controller and wrote/rewrote SW for that.


grtz

Simon
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Old 28th August 2002, 07:10 PM   #9
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I hope you all can download the files from the following location:

http://blu_dot.tripod.com/audio/sch.pdf

http://blu_dot.tripod.com/audio/Final_V1.c

Otherwise give me a mail.

The design is based around a PIC16F84 with several PCF8574's so called IO expanders.
The PIC does the decoding of the RC5 codes send from a standard remote control. Every Device, cd, TV, has its own 5bit address followed by the command, being volume up/down etc.
The decoded RC5 codes are here indeed used for volume control, channel control and steering of an LCD.

The RC5 receiver is a standard device which is sensitive to the particular 38KHz modulated code. The device just gives you serially what you've send.

The micro also decodes the rotaty encoders, also used for volume and channel control.

After decoding all the stuff and updating the respective variables it is send out via I2C to the io expanders.
These control relays for the volume and channel selection.

The SW is in C and written for the CC5X compiler.
The eval version lets you make code of 1k max. But that is enough in this case.

Via a PIC programmer (dont buy that expensive stuff, look for the taite programmer and SW) i download the code into flash.
And that is it folks.


grtz

Simon
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Old 29th August 2002, 06:23 AM   #10
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Thanks for posting, Simon. Apparently neither link works.

Eric
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