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Creating a variable wien bridge oscillator
Creating a variable wien bridge oscillator
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Old 6th July 2016, 02:09 PM   #11
JMFahey is offline JMFahey  Argentina
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To drive a speaker you need WAY more current than what an emitter follower can supply.

Shortest path is to attenuate output signal and drive a chipamp, from LM386 to TDA 20xx to ....
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Old 6th July 2016, 02:14 PM   #12
Mooly is offline Mooly  United Kingdom
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Creating a variable wien bridge oscillator
^ LM386 is perfect for 9 volt battery operation. Follow the applications in the data sheet.
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Old 6th July 2016, 03:11 PM   #13
Tedknowlegy is offline Tedknowlegy  United States
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The values of 10K and 10uF look like they are too much of a load for the opamp. I would go with something like 100k dual pot and 0.1uF.

Use a buffer amp for the speaker...LM386 or TDA2002, or similar.
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Old 7th July 2016, 06:19 AM   #14
Pafi is offline Pafi  Hungary
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Quote:
Originally Posted by ARNAB KUMAR MONDAL View Post
I had built the oscillator and now I want to drive it using a speaker . So i Had used an emitter follower . BUt somehow the speaker is giving a very reduced voice output. How do i increase the power more. Also can you give the schematic of your oscillator
Attached a simple square+triangle+sine generator. The sine is very rough, THD is about 2...5%.

For higher power you can use any power amp IC, or if you like emitter follower, then it should be complementary, with a little higher quiescent current.
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Old 7th July 2016, 06:44 AM   #15
Elvee is offline Elvee  Belgium
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Documents of interest:
http://www.sdiy.org/colbecklabs/spec_sheets/AN-263.pdf
ftp://ztchs.p.lodz.pl/PRP/PRP_2008_2009/LB-16.pdf
And in the context of speaker driver applications, this one too:
Automatic resonance frequency finder
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