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Topic: Need an Arduino Tone Digital Volume Control Method (Read 4 times) previous topic - next topic

CrossRoads

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

greenman


This one looks good too
http://www.analog.com/en/digital-to-analog-converters/digital-potentiometers/ad8402/products/product.html
PDIP for ease in prototyping also.
Sweet! There are quite a number to choose from even when narrowing it down to the ad8402.
Is there a particular one of those listed that you would suggest?
Just to be sure - this is still a linear rather than logarithmic solution, right?

You got me thinking about digital potentiometers, so I looked here to find out who sells in lots of one.
http://octopart.com/parts/search?q=digital+potentiometer
I might be able to buy a few other parts at the same time.

If nothing else, it will be interesting and hopefully entertaining to figure out which pin connects where.

Again thanks.

CrossRoads

You have to look at each one to see which are linear or logarithmic. This one is linear I think.
I suggested it because of the package type, surface mount parts can be difficult to prototype with.
Alas, Dual Inline Package (DIP) availability is going away for many parts. Unless someone comes up with a line of really inexpensive breakout boards for the myriad of part types, the cost of prototyping will either rise with having to make  custom board for any layout, or just become cumbersome with the one-size to accomodate many parts kind of breakout boards. (one for quad flat packs in different pitch widths; small outline packages; thin small outline packages; leadless packages; etc).
http://www.schmartboard.com/index.asp?page=products are examples of one size to accomodate several package sizes
http://www.logicalsys.com/smt-to-thru-hole-adapters.asp  are examples of specific package size parts.
Both are pricey to stock up on to just have around for experimenting - one really needs to know what is needed for a project.

I am toying with the idea of making a 10" x 10" board of footprints for $95 here, cutting them up hacksaw and adding square posts for breadboard use as I go.
https://www.internationalcircuits.com/layer_grid.php?cat_id=13
These guys are in Natick, couple towns over from me.
Now that I've started playing with eagle I think I could pull that off - question remains, what packages to use? And then try & go for fancier surface mount pads underneath to keep the pin width at 0.3" like a DIP for easier protoboard/ breadboard usage?
I guess if boards are say 0.4" wide by 1.2" long for a 20 pin TSOP part, that's only 0.48in^2, could fit 20 across the board, and have 8-10 rows of different part types. Or maybe 10 each of 2 types across the board, go for 20 differente types on a board.

Anyway, that's a different discussion.
8402, DIP package, with TL072 opamp for output buffering, sounds like a good plan for driving earbuds or other high impedance (as compared to 8 ohm) drivers.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

greenman


Alas, Dual Inline Package (DIP) availability is going away for many parts. Unless someone comes up with a line of really inexpensive breakout boards for the myriad of part types, the cost of prototyping will either rise with having to make  custom board for any layout, or just become cumbersome with the one-size to accomodate many parts kind of breakout boards.
I see what you mean about availability. Almost everything is now surface mount, and there all a lot more expensive.

8402, DIP package, with TL072 opamp for output buffering, sounds like a good plan for driving earbuds or other high impedance (as compared to 8 ohm) drivers.
For the price and availability, linear will have to do.

Again thanks.

greenman


I am toying with the idea of making a 10" x 10" board of footprints for $95 here, cutting them up hacksaw and adding square posts for breadboard use as I go.
https://www.internationalcircuits.com/layer_grid.php?cat_id=13
Looks like someone already has had a similar idea and is selling it on ebay.
http://cgi.ebay.com/SMD-CONVERTER-ADAPTER-PCB-SOT-MSOP-SIP-DIP-14-/120628243230?pt=LH_DefaultDomain_0&hash=item1c1600eb1e#ht_2710wt_905

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