Audio OP-MAP Based on LM358

tree1995 New member Username: Tree1995 Post Number: 2 Registered: May-17	Posted on Tuesday, August 22, 2017 - 06:10 GMT Audio OPAMP Based on LM358 I have built a microphones audio amplifier circuit using LM358 according to the following circuit diagram. Now I am confusing about three following questions: 1). how many is the actual magnification if I change R5 directly to be a 1M resistance? 2). What is the purpose to get median between the positive and negative resistance in the input terminal of amplifier? 3). Is this circuit belong to reverse amplification? Or positive amplification? The real effect is worse than single-op-amp even I magnify R5 to be 20K. Some people may ask me why here use LM358? Because I think I need the single power to provide 5V. According to the datasheet of LM358,itï¿½€™s more suitable and up to now,the effect could be accepted. Could anybody here solve my problems? Thanks a lot ! http://www.kynix.com/uploadfiles/pdf2286/LM358AD.pdf
Jan Vigne Platinum Member Username: Jan_b_vigne Dallas, TX Post Number: 18445 Registered: May-04	Posted on Tuesday, August 22, 2017 - 11:31 GMT . Take your question here; http://www.diyaudio.com/
tree1995 New member Username: Tree1995 Post Number: 3 Registered: May-17	Posted on Wednesday, August 23, 2017 - 02:34 GMT Hi,Jan Thank you for your kind remind!
Daniel Mathew New member Username: Danmathew United States Post Number: 9 Registered: Dec-17	Posted on Sunday, December 03, 2017 - 16:14 GMT Where you want to use this circuit?
Lauri Buell New member Username: Lauribuell Post Number: 1 Registered: Nov-18	Posted on Thursday, November 01, 2018 - 18:03 GMT Well you could make a VCO with square and sawtooth waveform outputs as shown in the DS. That's useful tool for a workbench depending on what else you're into.

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