ZBasic Forum

It looks as if the fact is that the circuit "works". Presumably as intended For some reason it even works for the robotic hobbyist, which used this circuit for his robotic audio sensor. The design came from one of the brightest engineers that work in the valley . We just modified its use ...

For those "daring users" who attempt to construct this simple sound sensor a word of caution. The Electret microphone has a protective felt-like protective cover of which you will have to remove to have the microphone functional. Also, on the schematic R17 should be a 1M not 1K! :) :) :) -...

The output is @ 3.06 VDC. When there is a loud noise the amplifer amplifies the input signal 1000 times to several hundred millivolts RMS A.C. Thats why we get a "signal range" from (single-float) .35 to ~1.0 on the analog input. That's our circuit which works! If you don't believe us plea...

From the original post. The operation of the sound sensor is very simple. The Electret Mic just outputs a few millivolts. The LM741 has a gain factor of ~1000 to feed into the ZX-xx analog input I did not review the schematic ... R17 should be 1 Meg. I just fired my neighbor. Connect the microphone ...

Connect the microphone directly to the rectifying/peak detecting diode Tom's Design flaws #1 The output of any Electret Mike is just a few millivolts! Good luck in trying to increase this signal to the ADC input without an opamp amplifier!!!! Elementary Electronics 101 #2. Impedance mismatch will o...

Here is a view of the thoroughly tested sound sensor. Talk is cheap. We test before we post! :D :D :D What Tom does not realize is all we are looking for is a sizable increased in amplitude of the pre-amp. The range varies between .35 to 1.0 using the GetADC(pinx,single) command. It will not pickup ...

The LM741 with a CA3140E will both work.

If it works for you, that's not good enough.

To make Tom feel happy ... replace the LM741 with a CA3140E.







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ZBasicAndy

Again, we will stand on the merits of this design.
If you have a better low cost circuit please feel
free to post it on another link.
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ZBasicAndy's neighbor

For some unknown reason it works just fine in this application.
Total parts cost ~$2.00 plus Electret Mic.

There are times when a software project is completed that the software developer would like to preserve his algorithms from others. Is it possible to password / encrypt a basic "code module" so others cannot view and modify its contents?

Ever needed a sound sensor attached to a ZX-xx Microcontroller? Here it is. We use this sound sensor it to pick-up alarms from the following devices which generate a high decibel sound output: (The sound sensor (Electret Mike) is place near the device.) Carbon Dioxide CO2 Detectors/Alarms. Carbon Mo...

So you are implying that it could be done with a 25% increase in speed and 2 times the ram ... sound good to me.

With the proper support components it might be able to be have a wide range of operating voltages (2.7-5.5)

Everything (software & timing) changes when you vary the supply voltage. Thats why it has to be at a fixed voltage using ZBasic's VM.
Correct me if I am wrong.

As far as I know, all versions of the ATMega32 processor are only rated up to 16MHz You are 100% correct but ... go to www.avrfreaks.com and under devices check out what 40 pin device is similar (pin compatible) with the ATmeg32 which has a 20 MHZ rating. You will find the "644" with twic...