Help: Guitar Tuner

[jbenz]

Hi,
I have to do a class project: a "guitar tuner", but without using IC's, only transistors.

If someone could just tell me what I need ,or links of schematics I would be very grateful.

Thanks.

 

[audioguru]

ICs are used today. Transistors might have been used a few hundred years ago.

 

[HiTech]

Why not build a simple transistorized tone oscillator tuned to 440hz? You can use it to tune the A string and from there all other strings are tuned in standard guitar tuning fashion... just as you would do when using a 440hz tuning fork.

 

[Pommie]

I saw a very interesting guitar tuner a while ago. It consisted of an oscillator that flashed an LED at 440Hz but with very short duration. You held the device near the string and it acted like a stroboscope. When the string looked stationary it was tuned.

Mike.

 

[Mikebits]

Transistors might have been used a few hundred years ago.

Was that the lightning Key junction device?

**broken link removed**

 

[CynicalMan]

Do you mean some thing like the attachment?

I have one of those. It's extremely accurate but its fragile and buggy. For example, on of LEDs on mine isn't nearly as bright as the other.

 

[Pommie]

Do you mean some thing like the attachment?

I have one of those. It's extremely accurate but its fragile and buggy. For example, on of LEDs on mine isn't nearly as bright as the other.

That is because it is made cheaply. There is no reason that something like this couldn't be extremely accurate and reliable. It would be a very good solution to the OPs problem.

Mike.