how to hookup speaker to eprom chip?

i have a eeprom chip with sound in it but i don't know how to wire a speaker to it how do i?

You need something to read the data out and create an analog waveform to feed into an amplifier to drive a speaker.
Start with the basics - what kind of EEPROM, what kind of sound? Is it a digitized waveform, if so what sample rate and how many databits per sample? If not, what is it?

i have a eeprom chip with sound in it

No you don't.
If you have an EEPROM it might contain sound samples but not sound.
First you have to read the samples into the Arduino. But you need to know:-

  1. The sample size, one or two bytes per sample.
  2. The sample rate of the digitised sound.
  3. The EEPROM interface so you know how wire up your Arduino.

We need to know what sort of Arduino you have and how long your sound samples are.

The [u]Audacity Website[/u] has a nice introduction to how digital audio works, but it doesn't get into the detail of how the data is stored on a disc or in memory.

:frowning: This could be tricky... It's probably impossible or impractical depending on what you know about the data in the EPROM.

There are lots of sound formats, some compressed, some uncompressed. If you don't know the format you won't be able to use the data. There's also MIDI (and MIDI-like formats) where the file/data is "notes & timing" and the sound is generated/synthesized elsewhere. The Arduino [u]Play Melody Example[/u] stores the notes & timing in memory, then generates the sound with the tone() function.

The data in an EPROM isn't accessed like a computer file with a file system & file name (although it's sometimes formatted like a sound file), it's addressed and you need to know the address range.

Of course, you need a way to read the data. The easiest way is with an [u]EPROM programmer[/u]. (Programmers can read and write so that you can copy & validate chips.) But if you don't know the format, the EPROM data is going to 'look random" and be mostly unusable, except possibly for some readable text.

The programmer can copy the data into the computer, but it's not going to be structured as a WAV or MP3 file, etc., and the programmer won't directly "play" the data... You'd have to do that with another application after the data is copied to the computer.

If you want to "play" the sound directly from the chip, you need a way to read (and possibly a way to decode/decompress) the data in real-time, a clock to set the sample rate, a digital-to-analog-converter, and an amplifier to driver the speaker (or powered/amplified computer speakers).

Maybe it could be done without any Arduino or other microcontroller?

What if you were to connect a digital counter to the address pins and a R-2R resistor ladder (or other non-clocked DAC) to the data pins, and wire RD and CS low (always asserted)? Most EEPROM chips will allow you to change the address in the middle of a read. So this just configures the chip for one long permanent read operation and then sweeps through all the addresses.

If the counter is a ripple counter like a 74HC4060, or if the EEPROM doesn't have perfectly uniform access time, you might get brief glitches because the address or data pins do not all change at precisely the same moment. But maybe that's ok if the clock isn't terribly fast? You can perhaps low-pass filter the DAC output if the glitches are a problem.

The counter will of course need a clock. For extra style points, use a 555 timer. Maybe even make a meme about using a 555 instead of an Arduino!

Of course that will only work properly if the sound is stored as uncompressed 8 bit samples as unsigned numbers that map onto the 2-2R ladder or whatever DAC chip you use.

If the chip contains signed 2s complement format integers, which is probably the most common format for uncompressed audio, you'll hear a pretty distorted signal that resembles the intended sound but is obviously not correct when heard. You'd need a circuit to convert signed numbers to a voltage, rather than a simple R-2R ladder which works only with unsigned numbers.

If the chip contains 16 bit samples, you'll hear the signal at half speed plus a tremendous amount of noise, since every other output will be the low 8 bits which are effectively a random number (white noise) when decoded this way. But that sort of issue might be solvable by connecting A0 low or high and connecting the counter pins starting at A1 instead of A0.

If the chip contains data encoded in some compressed format like MP3, you'll near nothing by static.

If the chip has sound clips but also chunks of code or other non-sound data, you'll hear bursts of noise or or clicks or chirps or other weird noises as the non-audio data gets converted to waveforms.