Remote Control

[palesha]

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

 

[Freddie]

Check out: http://www.rentron.com/

I'm about to start building a simple remote control/receiver with the Holtek HT12-D/E chips.

/Freddie

 

[trwh]

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.

 

[trigon]

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

 

[trigon]

Here it is.

Trigon.

 

[blu_line]

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

 

[palesha]

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

 

[blu_line]

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

 

[blu_line]

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

 

[capslock]

Thanks for posting, Simon. Apparently neither link works.

Eric

 

[blu_line]

Any one an idea how i can make the files available to you all ???

grtz

Simon

 

[jan.didden]

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

Hi blu-line,

I'm also involved in a project using i/o expansion. As far as I know, the 16F84 doesn't have I2S onboard, did you implement that in software? Any particular problem with that?

Jan Didden

 

[blu_line]

Hello Jan,

I indeed implemented the I2C driver in SW.
There were no problems.
It will cost you a few lines of code and 3 pins.
The 3 pins are necessary for the CLK, data_in and data_out.

If you have anmy particular questions, just mail me !


grtz

Simon

 

[guido]

Hi,

16F84 to decode RC5 and control a preamp. Sounds familiar to me, check my website. Programming here is in assembly, pic is in sleepmode when no code is received. Other features are an encoder on the volume pot to read the position and the pic can control my kenwood tuner via kenwood XS protocol (8bit version).

The RC5 decoding routines are on the site, i put them there because they are based on a statemachine in software. Works very well. Preamp itself is the Audio&Techniek P11 (Hawk audio nowadays). Tube stuff.

Greetings,

Guido

 

[blu_line]

The "Guido" of Guido Tent ?

Ah well, when you think of it more people probably invented the wheel in this case.

grtz

Simon

 

[yugaaa]

hi palesha,
there is a kit avaliable in chennai and the remote control is based on a philips ic.it has got adjustments for a valume control ,balance,mute ,2inputs,bass and treble.plus a timer .The shop sells it as an addon kit.i personally didnot check the remote control on my amp as i did not want unwanted distortion.

 

[guido]

Nope,

Not the Guido as in Guido Tent. Although both dutch (think it is an italian name).. And i am using his clock in my CD63.. Small world. If there is anything usefull, drop me an email.

Greetings,

The other ''Guido"