Bird chirps, freight trains, racetrack engines, sirens, phasor guns, organs (with additional push buttons), wind, jungle, and other noises may all be produced with this sound generator chip.
Extremely low-frequency oscillation (SLF), voltage controlled oscillator (VCO), and noise oscillator are its three oscillators. You are free to choose any three of these combinations.
The gunshot acoustic was much more realistic thanks to the sound decay mechanism. I have an old data sheet with several audio applications that I have discovered.
In order to provide other sounds, I intend to add several rotary switches with configurable capacitors.
Apparently are two sizes for this chip, which buyers should be informed of. The smaller version is the SN76477NF, and the regular big size is the SN76477.
It would prove rather challenging to make use of the NF size socket without a printed circuit board or an adaptor.
After a long wait, I was thrilled when I got two of the bigger SN76477 sound chips. I had no success finding someone who has used this chip to make a mg sound when searching the Internet.
In the end, I added a 555 timerchip and connected its pulsating output to pin 9 of the one-shot circuit.
To choose between the continuous mg sound and the one-shot sound, I built an SPDT switch. I have both sound kinds controlled by push buttons. SN76477 is being powered by a 9 volt battery that I have.
I'm powering the 555 IC with the 5 volt output which this chip regulates. I can use an ohm-meter between every point of testing and "G," or ground, and switch off the wiring to the ic pins thanks to the test points. Every potentiometer has a resistance setting that I can adjust.
In addition, I installed a connection for my 200-watt amplifier. I have yet to give this a try.
I actually had to cut down the lengthy video I had intended to give you an overview of each feature since my iPhone claimed it was too big. I'm currently collaborating on the updated schematic and will email it shortly.
This is the updated experimenter's board schematic, which fixes the pin 9 mistake. To enable one-shot noises, provide a positive pulse to pin 9.
To disable all sounds, operate a switch in parallel to the push button and set it to +5.To solve the issue, I updated the design to include an SPDT switch on pin 9.
In the future, I plan to incorporate rotary switches for selecting different capacitors and expand my sound library. In order to bring together the sound oscillators, three spst switches must be additionally added on pins 25, 26, and 27.
