Can you solder to SMD? I never tried it.reason for SMD
Yes, but you did not show how you will make a clean 3.3V supply. You showed a 3.3V battery.R7 is supposed to be connected to a clean 3.3v supply
Where will you find a 5V battery? I would power everything from a small rechargeable 3.2V to 4.2V Li-Po battery made for micro RC model airplanes.the op amps opa4364 power is 5v
No, it is in an 8-pins DIP through-hole package. A TDA2822D is in an 8-pins surface-mount package.the tda2822m? is an 8 pin smd
Your highpass filter cuts frequencies below 300Hz so everything will sound "tinny" like a telephone. You do not need a lowpass filter to cut ultra-sonics above 14kHz.Will see if the speech filter can be tweaked for higher range to 14khz (using a TINA example circuit) or add a high pass filter to the mix.
ANY opamp works perfectly from a single supply when it is biased properly. Your opamps B and C are not biased properly.NOTE the opa4364 is a single supply op amp BUT the data sheet mentions a buffered reference voltage if this is any help?
It is probably all that is needed. Notice that it does not "narrow" the frequency response. Instead it boosts or cuts low medium or high frequencies.wondered if just using a 3 band frequency control using multi turn pots and adjust as needed.
You did not attach your simulation.here is a "frankestein" simulation. I can get to 300hz but it won't roll off until 100khz+
I didn't know that. My ears produce 20Hz to about 16kHz (higher frequencies can not be heard anymore because I am an old geezer).Each ear is different as far as hearing frequencies.
Digikey sent me lots of surface-mount CD4017 ICs by mistake. I should try them.I am assembling the KRITTER RIDDERS" using SMD (1206) with very little problems since I got my temp control soldering iron kinda working right.
I have lots of them. A new inexpensive powerful one is coming soon. It is only 1.5" long.I like the re-chargable battery idea.
A series resistor then a capacitor to ground makes a pretty good power supply filter. You do not need a voltage regulator.As far as CLEAN I was thinking an LM317 if it comes in SMD and lots of filter caps.
Hee, hee. Speak up I can barely hear you!If this contraption works perhaps I could build you one?
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