My first attempt at this was with a relay and a 555 timer, and it worked OK. I wanted to do this with a circuit and eliminate the moving parts. The silver thing that I saw did not use a relay -- Well... At least I did not hear a relay activating. I was told later on that it was done with a...
I need a circuit that switches the positive and negative between two separate terminals at a specific interval. This is for dispersing copper in water for a project that I am working on. I want to reverse the polarity of the conductors so they will be "self cleaning" and I want to prevent...
I want to know if I am figuring correctly. I am putting together a 12 volt 3 amp DC power supply. The formula in the instructions is C = Tc / R. I figured the required cap to be 20,750 uf. When I went to a couple of supply catalogs to check the price for the cap I found that no one had had a...
I did look into a digital voltmeter last week for the system. It was pointed out to me that when I attempt to calibrate the timer I would be sending less or more voltage to the panel mount potentiometer there by changing the voltage coming out. So, if I was originally dispensing 12 ounces of...
I want to first thank all of you for your help with my first 555 timer question. With that help and some more reading on the net I have it working perfectly.
My next task on this timer project was to include an LED display. My intention was to have a display that would give me a numerical...
Let me make sure I understand what I need to do with this resistor. I would connect it to the positive voltage on my breadboard and run it to the input trigger (Pin 2). Is that correct? Also, I did not have a filter capacitor on my power supply. Could that have damaged my 555 timer...
I am using the momentary switch to short pin 2 to ground. I did not know what a pullup resistor was when I read your reply. After I read up on the definition it sounds like a handy component. I could get a pullup resistor when I place my next order. My first thought is that in all of the...
I have been having a great amount of difficulty with the 555 timer (Texas Instruments NE555P). I am going through a book published by McGraw Hill titled Understanding Electricity and Electronics. While I was waiting for the parts to finish my power supply, I started to work with the 555 timer...