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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I have run into problems using a pull down resistor and a switch to +5 V, as well as a debounce capacitor. Immediately after the switch is pressed the capacitor can draw a lot of current as it charges, pulling down the +5 V supply and causing problems with the rest of the...
gEDA suite comes with free and open source schematic and circuit board layout software. It does not have the annoying board size limitation that the free version of eagle comes with.
gEDA Project's Homepage
There is also a link to free simulation software and other free electronics design...
You could use a phototransistor and an LED. Set it up so the flapper itself breaks the beam. Then the flapper will not have to be driving any mechanical load.
You may want to go to a local hobby shop and see what they have for RC airplanes. You might be able to find a ready made radio controlled switch. If not, it shouldn't be too hard to make a circuit that will interface with the receiver. Or you could just use a RC airplane servo to connect a...
It looks to me like the right circuit will turn Q1 and Q4 on, or Q2 and Q3 on at any given time. This will not create a short. There are no flyback diodes on this h-bridge. That will allow voltage spikes from the load to damage the mosfets.
The top side diodes in the left circuit are...
Is this a standard RC airplane remote controll setup?
If so the white wire is not DC voltage, but a variable length 4.8 V pulse.
1 ms pulse for low signal, 2 ms for high signal. This pulse repeats itself at some set frequency.
This will apear as a small DC voltage if you test it with a...
You could make a circuit that will convert the potentiometer position directly to a periodic input to the PIC. Then use tho PIC to measure the length of time it takes for the input to change from high to low. Use this to set the LED frequency... Of course if all you want to do is change the...
Sounds like you will need two seperate circuits. One for transmitter and one for reciever.
You can get a PIC with PWM output built in. I think this would be the easiest way to implement your transmitter.
If you are already set on a device that does not have a PWM peripheral --...
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