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Re: On - Off Switch with a momentary Button

 by lyndon ¦  Tue Aug 07, 2018 7:08 pm ¦  Forum: Projects ¦  Topic: On - Off Switch with a momentary Button ¦  Replies: 3 ¦  Views: 213

I would go the ATTiny route or even the Arduino route. By the time you have all the bits for a DIY AT Tiny board, you're past the price of a cheap Arduino. Alternately, you could use a binary counter and every time you close the switch, you get a toggle on D0. But here, you'll need some kind of debo...

Re: Trouble with a Transducer - Trying to switch it off

 by lyndon ¦  Wed Aug 01, 2018 11:41 am ¦  Forum: Projects ¦  Topic: Trouble with a Transducer - Trying to switch it off ¦  Replies: 10 ¦  Views: 784

I'm confused.
In his first post jremington told you how to address the problem. What is wrong with that solution? As far as I can tell from your problem description, it should work just fine.

Re: Need part help

 by lyndon ¦  Tue Jul 31, 2018 8:22 am ¦  Forum: Projects ¦  Topic: Need part help ¦  Replies: 8 ¦  Views: 256

You can find them at most hardware stores or Home Depot.

You can do basic I/O using the serial port handshaking lines on your computer. Since your PC likely does not have a serial port, a USB to serial converter works fine. I had a little tutorial about it. http://www.cedarlakeinstruments.com/SharedFiles/io.html

Re: Using a Potentiometer with MP3 Trigger & Speaker?

 by lyndon ¦  Sat Jul 21, 2018 2:06 pm ¦  Forum: Projects ¦  Topic: Using a Potentiometer with MP3 Trigger & Speaker? ¦  Replies: 8 ¦  Views: 452

My thought was to take an old MP3 player and solder in extended pushbutton to the Play/pause button. For audio, if you can't find an amplifier that lets you control the L&R channel volume separately, you could build two small amplifiers based on the LM386

Re: Using a Potentiometer with MP3 Trigger & Speaker?

 by lyndon ¦  Sat Jul 21, 2018 8:44 am ¦  Forum: Projects ¦  Topic: Using a Potentiometer with MP3 Trigger & Speaker? ¦  Replies: 8 ¦  Views: 452

I'm guessing you don't have any software development experience? If so, then I'd just get an Arduino and start playing with it. Once you're comfortable, then you can explore using an MP3 trigger or look into the WAV trigger audio player. Honestly, based on your description, you could probably find a...

Re: Reflow bridging issue

 by lyndon ¦  Sun Jul 15, 2018 10:12 am ¦  Forum: Projects ¦  Topic: Reflow bridging issue ¦  Replies: 3 ¦  Views: 321

Possibly, a thicker stencil will hold more paste. I also use the OSH Stencils default thickness. I don't remember what that is, but it works fine with my 64-TQFP devices. I have never tried QFNs. The "trick" I learned with wick was to use extra flux and make sure the tip of the iron is well tinned, ...

Re: Reflow bridging issue

 by lyndon ¦  Fri Jul 13, 2018 11:24 am ¦  Forum: Projects ¦  Topic: Reflow bridging issue ¦  Replies: 3 ¦  Views: 321

In my experience, bridging is most frequently due to too much paste being applied. Best way to clean up most bridges on small pitch components is with solder wick. Rubbing some flux on the wick helps too.

Re: miniature transmitter + receiver + speaker

 by lyndon ¦  Wed Jul 11, 2018 10:01 am ¦  Forum: Wireless/RF ¦  Topic: miniature transmitter + receiver + speaker ¦  Replies: 7 ¦  Views: 664

It's a keyfob-sized wireless remote control module for a battery powered product.

Re: miniature transmitter + receiver + speaker

 by lyndon ¦  Tue Jul 10, 2018 7:59 pm ¦  Forum: Wireless/RF ¦  Topic: miniature transmitter + receiver + speaker ¦  Replies: 7 ¦  Views: 664

My SWAG at a minimum quantity for that pricing would be around 30,000/year. But that's probably a bit low. I was kidding about doing this design: I don't do consumer products and try to avoid wireless. $25k is in the ballpark of a basic hardware/firmware design of a similar device I know of. You'd h...

Re: Connect arduino to phone line

 by lyndon ¦  Tue Jul 10, 2018 10:51 am ¦  Forum: Arduino ¦  Topic: Connect arduino to phone line ¦  Replies: 3 ¦  Views: 639

As mike said, the standard device for this application is a DAA. If you can find an old serial modem, that may also work. You ATDT the number then send a modem command to go into voice mode and you can use in-band signalling for the information. You can build a DAA from a couple of transformers and ...

Re: miniature transmitter + receiver + speaker

 by lyndon ¦  Sat Jul 07, 2018 5:57 pm ¦  Forum: Wireless/RF ¦  Topic: miniature transmitter + receiver + speaker ¦  Replies: 7 ¦  Views: 664

Sure. I can build you a system that's about the size of a small coin cell and the battery will last around a year. Will that work? Cost will be around $25,000 for the first unit. Can go smaller than that (you did say as small as possible), but cost increases rapidly. Or, you could, you know, use num...

Re: Analog to arduino to op amp to arduino?

 by lyndon ¦  Thu Jun 28, 2018 5:00 am ¦  Forum: Arduino ¦  Topic: Analog to arduino to op amp to arduino? ¦  Replies: 9 ¦  Views: 667

Possibly against my better judgement I'm going to respond to this. Primarily because I don't want anyone reading this to be put off from asking questions lest they feel slighted by the responses, or those of us who give our time to answer questions to have even more reasons to not continue to do so....

Re: Analog to arduino to op amp to arduino?

 by lyndon ¦  Tue Jun 26, 2018 1:47 pm ¦  Forum: Arduino ¦  Topic: Analog to arduino to op amp to arduino? ¦  Replies: 9 ¦  Views: 667

If your question is merely hypothetical, then say so. It will certainly work, but it adds additional components & complexity for no benefit.

Re: RF Inquires

 by lyndon ¦  Tue Jun 26, 2018 8:42 am ¦  Forum: Arduino ¦  Topic: RF Inquires ¦  Replies: 1 ¦  Views: 264

Adafruit has a 4-button keyfob and a receiver with 4 outputs.

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