Um...Me123 Posted March 19, 2006 Report Share Posted March 19, 2006 I just have a quick diode question.All I want to do is only let a 9VDC current flow in one direction!! What kind of diode do I use?? I dont need to amplify or anything special. Rectify? Zener? Switching? I really don't know the difference.If you want to write a whole essay about diodes feel free but please post a short answer first. I'm ordering stuff now.Sorry for the dumb questionThanks Quote Link to comment Share on other sites More sharing options...
SM2GXN Posted March 19, 2006 Report Share Posted March 19, 2006 Hi Um...Me123!If the current consumed by the load not exceed 1A you can chooose any of 1N4001-1N4007 Quote Link to comment Share on other sites More sharing options...
Staigen Posted March 19, 2006 Report Share Posted March 19, 2006 Hi Um...Me123Sorry for the dumb questionNo question is too dumb, dumbness is to not ask! ;DNow to your question!You didn't supply us with enough information to properly answer your question!How much current through the diode? That will determine the diode.Up to 1 Amp a 1N400x diode will fit nicely, up to 3 Amp a 1N540x diode will fit,for higher currents a diode at higer rating is needed. Look at datasheets, andsearch the internet! The x in above diode names is a figure between 1 and 7.Hey, the current from a battery can only flow in one direction, so maybee youdont need a diode, the diode will waste about 0.5 to 1 volt of your batteryvoltage! ;DIf you supply us with more information we can give you a more accurateinformation!Staigen Quote Link to comment Share on other sites More sharing options...
Um...Me123 Posted March 19, 2006 Author Report Share Posted March 19, 2006 Here's my project:I have 2 circuit boards from an old remmote control car. It was the type where you control both wheels individually. Forward and backward for each.So there are 4 wires going to 2 motors (which I cut off) the voltage reverses for forward and backward. What I'm going to do it conect it to 4 relays and use diodes to determin whch of the 4 it turns on. (So basically the same wire may be positive or negative because it splits and has diodes. Not sure of the amps but it runs on 9V.I haven't decided on how to power the 9V be cause I'm using the relays to control 120VAC and other stuff (less than that) I may use a small amp (so it's cheaper) transformer. Quote Link to comment Share on other sites More sharing options...
Staigen Posted March 19, 2006 Report Share Posted March 19, 2006 HiWas it a propotional control of the motors?And was it digital?//Staigen Quote Link to comment Share on other sites More sharing options...
Um...Me123 Posted March 19, 2006 Author Report Share Posted March 19, 2006 Um....I don't know?? Quote Link to comment Share on other sites More sharing options...
Staigen Posted March 19, 2006 Report Share Posted March 19, 2006 HiPropotional means that you could move slowly with the car by just press thecontrols a little bit. If its only zero or full speed backwards and forward it isprobably not propotional, and will work just fine here. Use some 1N4001,they are cheap and redily available. And, yes, you should use a diodebackwards over the relays.PIV means Peak Inverse Voltage and is the max voltage the diode can standin reverse.BTW, how is it going with your PSU?//Staigen Quote Link to comment Share on other sites More sharing options...
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