I have a situation in which there is a 30 year old device that has a 5V powered, 40 pin Mostek CPU. It turns out that the code on the chips was never made open to the public, and if you can find an un-programmed one, they are very expensive.
So, I thought it would be a fun project to make a new version of it, using a modern chip. However, I wanted to protect the input voltage, and be as simple as possible.
The chip can run around 3-5.5V. The input voltage from the power supply is 5V, but is known to cause spikes that fry the chip. What is the best way to protect the chips power input? A zenner diode?
So, I thought it would be a fun project to make a new version of it, using a modern chip. However, I wanted to protect the input voltage, and be as simple as possible.
The chip can run around 3-5.5V. The input voltage from the power supply is 5V, but is known to cause spikes that fry the chip. What is the best way to protect the chips power input? A zenner diode?