Hi, I want to build my own keypad circuitry and I heard that I should include diodes in the circuit to prevent circuit from flowing in the opposite direction. Is there any metric I can use to determine what is the best diode to use?
My knowledge of electronics is limited.
Diodes are implemented so you can push multiple keys at the same time. Any small signal diode will do; there are no massive currents flowing. I would e.g. use/try a 1N4148 but I'm sure there are others.
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Just about any diode will work. For obvious reasons you do not want to use a 100A diode (space)but it would work. 1N914, 1n4148, 1N400x etc would work.
This is correct.
Look for a diode that is described as a signal diode rather than a rectifier diode. They are often cheaper as well because they are not designed for heavy current. These are often wire ended devices with a glass encapsulation.
just did a search at digikey.com and through-hole signal diodes cost about 4 cents each when you buy 100, 8 cents when you buy 10, and 10 cents when you buy 1.
The price of each is about 1 cent if you buy 50,000 of them.
Okay I will see if I can get these signal diode in my local stores. If not I'll go on digikey to get more. Thanks!
That is quite pricy, I seem to remember getting 100 on ebay for $0.02 a year or two back.
Must be the current "supply chain issues". The cheapest 100-pack now is $1.49 plus $3 shipping from China.
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