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A quick intro to those who are still working (like me) with tangent or CMoy amps and have SMD or Pins on small parts to solder... I have Young-Onset Parkinsons Disease (Michael J. Fox, Muhammad Ali etc. etc.) so my hands are not as steady as they used to be...do not BUILD...when you can Mooch...
These EVM (evaluation modules) are built and designed for testing by huge IC firms... just look around and...'um... sign up...hehe..if you can't get Eval boards get sample parts! OP AMPS and many other components are FREE from the original manufacturer. Some are "alternative" parts and the DIP are usually the cheapest. SMD and SOIC devices tend to NOT come in single qty unless you pay a few dollars.
Easy search tools are online for various OP AMP power requirements, form factor and output ratings. Low voltage power requirements are best for portable iPod versions, however 12v+ power with amps over 10W per channel are available for speaker applications. Build your own iPod boombox or dock with amp & speakers!
http://focus.ti.com/docs/toolsw/folders/print/opamppro.html
Most IC firms have free SAMPLES and/or discounts for quantities of ONE. They usually deal with THOUSANDS of parts on tape reels. It's expensive for them to send you ONE part.,so they built these "testbed" or sandbox modules for customer testing...all pre made and with easy pins for attachment to power and audio inputs/outputs! Search IC makers websites and get free samples! These are NOT for resale and are for testing only...;)
You usually get ONE only...but of each type! Order seperate parts or all together!
Also see tangents excellent DIY amps & improved designs from Chu Moy's/Sijoase. Buy his low cost pre-fab IC boards!
http://tangentsoft.net/audio/cmoy-tutorial/ he has some parts and parts #'s for most distributors
and see the headwize DIY forums for the bleeding edge stuff...! ya way cool.
http://headwize.com/ubb/forumdisplay.php?fnum=3
Links to pictures of Sijoase's amps...was some talkway back of IC board production runs from Sijoase schematics...? hum?
http://headwize.com/ubb/forumdisplay.php?fnum=3
These EVM (evaluation modules) are built and designed for testing by huge IC firms... just look around and...'um... sign up...hehe..if you can't get Eval boards get sample parts! OP AMPS and many other components are FREE from the original manufacturer. Some are "alternative" parts and the DIP are usually the cheapest. SMD and SOIC devices tend to NOT come in single qty unless you pay a few dollars.
Easy search tools are online for various OP AMP power requirements, form factor and output ratings. Low voltage power requirements are best for portable iPod versions, however 12v+ power with amps over 10W per channel are available for speaker applications. Build your own iPod boombox or dock with amp & speakers!
http://focus.ti.com/docs/toolsw/folders/print/opamppro.html
Most IC firms have free SAMPLES and/or discounts for quantities of ONE. They usually deal with THOUSANDS of parts on tape reels. It's expensive for them to send you ONE part.,so they built these "testbed" or sandbox modules for customer testing...all pre made and with easy pins for attachment to power and audio inputs/outputs! Search IC makers websites and get free samples! These are NOT for resale and are for testing only...;)
You usually get ONE only...but of each type! Order seperate parts or all together!
Also see tangents excellent DIY amps & improved designs from Chu Moy's/Sijoase. Buy his low cost pre-fab IC boards!
http://tangentsoft.net/audio/cmoy-tutorial/ he has some parts and parts #'s for most distributors
and see the headwize DIY forums for the bleeding edge stuff...! ya way cool.
http://headwize.com/ubb/forumdisplay.php?fnum=3
Links to pictures of Sijoase's amps...was some talkway back of IC board production runs from Sijoase schematics...? hum?
http://headwize.com/ubb/forumdisplay.php?fnum=3
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for free then i was reading the pdf (http://focus.ti.com/lit/ug/slou060b/slou060b.pdf ) and it was a little confusing but from what i can understand, it says you need to get the sample amps separate and put them together yourself? please correct me if im wrong because if i understand correctly then i just ordered another thing i cant use.
Or do you have any links for free EVM as for http://redirectingat.com/?id=487X782&url=http%3A//focus.ti.com/docs/toolsw/folders/print/opampevm-sot23.html?
Beg borrow conjole you CAN get free via email, use their cloest competition as reference , cc emails from one to another. Get a price or discount then negotiate....you can do it.... I'm working on a whole EVM SYSTEM...for free!
http://focus.ti.com/docs/toolsw/folders/print/tpabasekitevm.html
Lazy try $5 boards - http://focus.ti.com/docs/toolsw/folders/print/opampevm-sot23.html
http://hackedgadgets.com/2007/03/24/diy-fm-transmitter/
http://www.diylive.net/index.php/2005/12/21/diy-fm-transmitter/
like at TI! http://www.ti.com/home_b_samples
right on their Homepage...did ya look at all?
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http://www.dealextreme.com/search.dx/search.FM%20transmitter
1-This is a inverting or power supply/filter opamp, we'd prefer a audio amp like a quality Burr Brown
2-this requires a power bypass, virtual ground or a voltage reference circuit. You realize this is 1/2 a amp rignt?
3-also a poor circuit for a gain adjustable amp...
4-read the Tagent tutorial & start with a cheaper CMoy with fewer parts and lower cost for better quality
5- don't start off with a SOIC opamp try a DIP which is easier for DIY
good luck
tagent tutorial
http://tangentsoft.net/audio/cmoy-tutorial/