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Old 17th December 2011, 01:45 AM   #11
vkj is offline vkj  India
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Quote:
Originally Posted by jerryo View Post
$42.00 Dollars is a bit steep!?
Try making the same set up your self for less. Impossible, I would say.
I have been running mine for 2 years or so and it is absolutely silent and works flawlessly. If it does show signs of degradind I'll just buy another.
The reason it does not have a balance control is that it is not a pre-amp; therefore it does not have tone controls either.
Ok. You havent said what you are using this board for, but for $67 (42+15) you could easliy build an entire hi-end preamp using PGA2310 ($19 from Digikey). Ive just made a small preamp for my bedside music player using a TDA7468 (~$10 from digikey), together with powered speakers. A PIC costs about $3. Besides controlling the TDA chip the PIC drives the 7-segment displays, power relays, muting relays etc. I added a white-noise generator, and by randomly varying the bass and treble controls (of the TDA), the PIC produces a nice "surf sound"! I also added a variable DC power output to provide auxiliary power supply to outboard sources such as MP3 sticks and my old Walkman. This variable power supply is also controlled by the PIC using the PWM output.

As I said, its worth thinking about. Just my 2p, based on my experience. I already have a spare motorized pot waiting to replace the old scratchy one. But the world has moved on since those days

vkj
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Old 17th December 2011, 08:14 AM   #12
jerryo is offline jerryo  Isle of Man
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Hi vkj,
if you have the required skills to do as you say then you may well be right; you have, but I do not. I still think that by the time you have bought the resistors, voltage regulators, chip sets, relays, motorised pot, capacitors, remote control handset and other assorted items, "and" designed and etched your own pcb's you are going to be spending more and that's without taking time taken out of the equation.
I used this volume board to replace a NAD pre-amp and found it to be a revelation in terms of the sound quality. I'm not sying by any means that it is "state of the art", far from it; but if you want a simple workman like solution to a remote control volume it works very well and is very easy to implement, especially for those that do not want to explore the much more technically superior route that you mention.
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Old 18th December 2011, 01:37 AM   #13
vkj is offline vkj  India
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Quote:
Originally Posted by jerryo View Post
Hi vkj,
if you have the required skills to do as you say then you may well be right; you have, but I do not. I still think that by the time you have bought the resistors, voltage regulators, chip sets, relays, motorised pot, capacitors, remote control handset and other assorted items, "and" designed and etched your own pcb's you are going to be spending more and that's without taking time taken out of the equation.
I used this volume board to replace a NAD pre-amp and found it to be a revelation in terms of the sound quality. I'm not sying by any means that it is "state of the art", far from it; but if you want a simple workman like solution to a remote control volume it works very well and is very easy to implement, especially for those that do not want to explore the much more technically superior route that you mention.
Sorry, I was under the impression that you were building a preamp. For your application, I would agree that its not worth it to build from scratch. However, I would urge you to buy a spare motorized pot. They are becoming quite difficult to find.

vkj
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Old 18th December 2011, 02:46 AM   #14
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If you're interested in an IR controller that provides volume control via RDACs, you might contact Uriah Dailey at BuildAnAmp.com or Bruce Heran at OddWattAudio.com.

The IR chip has a true logarithmic volume curve, better than any potentiometer I've ever seen. This is because it is done with an accurate logarithmic sequence rather than an approximation like potentiometers use. It also has a balance control, mute, power on/off and can select from five inputs (like for tuner, CD, phono, etc). There is one chip for stereo, and another for home theater, which also has a fader control in addition to balance and all the other features.
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Last edited by Wayne Parham; 18th December 2011 at 02:51 AM.
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Old 18th December 2011, 06:03 PM   #15
JesseG is offline JesseG  Canada
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Default IR Remote

Wayne
Can you post some photos / schematics / code etc for this rc project. It sounds VERY interesting. I have been looking for a simple to implement RDAC control and from your overview this sounds like just the thing
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Old 19th December 2011, 02:40 AM   #16
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I can provide schematics, yes. See below. But I would prefer it if you would contact one of those two sources mentioned above for other details, such as availability, pricing, etc. The only way the chips are available is through distributors such as them.

Each individual distributor can tell you what products they can provide, e.g. kits, printed circuit boards, and complete systems in addition to raw chips for DIYers.
Click the image to open in full size.
Click the image to open in full size.
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Old 21st December 2011, 08:33 PM   #17
Boscoe is offline Boscoe  United Kingdom
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Thanks for this, it's great. What sort of remotes are available?

Don't worry about the remote thing I just read the text, does Uriah Dailey or Bruce Heran have an email address so I can directly talk to them?

I would be very interested in the kits and PCB artwork and if possible permission for the to be used in a commercial product.

Thanks
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Last edited by Boscoe; 21st December 2011 at 08:52 PM.
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Old 22nd December 2011, 06:05 PM   #18
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I've sent you a PM. For your commercial queries, see the PM.

To contact Uriah and/or Bruce, you can post on their forums or click on the banner at the top of their forums to take you to their company website homepages. From there, you can find contact information. That's probably the best way to reach them.
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Old 25th December 2011, 07:44 AM   #19
dangus is offline dangus  Canada
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Nuts & Volts published an article on building a learning IR remote receiver. It used a PIC; the outputs would need some decoding.

If you just need to control a motorized pot, consider hacking a radio-controlled toy car.
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Old 25th December 2011, 09:02 AM   #20
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Yep, you did it the hard way. You're right in that it works VERY well in a micro. I'm not a PIC guy but I like the Freescale 68HC908 JK1/3/8 series which are 1K 4K 8K respectively. I successfully decoded Samsung commands, transcoded and re-transmitted so that the DLP set and the set top box behaved as a system rather than selecting STB and TV. I wasn't able to do the 38 KHz modulation solely in the micro but an extra 22V10 GAL fixed that up. The most tedious part was capturing all the Samsung commands using an IR reciever and a Tek TDS 3034 scope and print all the screen shots. It becomes pretty obvious what is going on. A long start bit followed by 32 bits where the lfisrt and ast 2 groups of 8 are inverse of each other. Sony is very similar.

Merry Christmas

G
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