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this is a very easy two axis solar tracker using the L298N dual H bridge board small mistake on diagram photo diodes are upside down but correct on board and 470uf and 100n go to ground. the board mounts above the driver board with 3mm rod.
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corrected circuit diagram
As you can see in my Video clip mine is working fine and so are the other 5 proto's i have made you can put one in if you like some of the way this is designed is from reverse engineering commercial ac finders they do not use a base resistor on there's so i didn't to save part count but works...
Sorry guys this is it now I have checked it again the MPS42 is used because the 22mh induct Causes high voltage spikes that amplify the output on the piezo transducer its an old method of getting more volume from a piezo. I had it marked as a PNP transistor somehow missed it the reason for...
I have made a small vid of the unit with 100K sens pot and you get about 500mm range max but my other prototype has a 500k pot and you get to much range, Also i have found an error the transistor T1 is a PNP such as BC557 with emitter going up to LED...
yes they are hard to find and they are Chinese IC's I got mine from Ali-express about 100 very cheap a few years back you have to be specific as they send you the 4069UB all the time, this is one chip the Chinese do better for this purpose.
I am having 100 PCB's made up at the moment as i...
I have found one of my prototypes with a 4069UB you get very modest range much like the commercial finders except still a lot better range is 6-12" but with the chip marked CD4069BE you get this remarkable range the sensitivity in a room has to be kicked right back as the RED LED is constantly...
2 meters is right no exaggeration front end is high impedance low pass filter you get an audible hum not a random beep so easy to discern what you are picking up, the 100k pot in series with the 27k sets the sensitivity and i have built 4 versions of this unit all work as described. only thing...
this is my personal design for a sensitive ac mains finder circuit this one is unique from anything that i have seen out there, you can very the sensitivity from touching the wire to picking up hum from 2 meters away or finding
cables through walls, it has a green led when powered up that goes...
no problem i just used what i had in junk bin rated at 400v at 6khz can't notice any flickering but be careful setting the pot almost burnt the neon lamp when i had a dry joint on the feedback transistor base. i had no control over the output.
I wanted an easy to make High Voltage supply for neon and tube circuits so I came up with this compact adjustable and easy to make all transistor supply works down to 5V.
the coil is important and value shown works well, it works at 6KHZ with the capacitors shown.
there is an error on...
Thank you SunnySkyguy its the high side transistor that was getting hot not the transformer but i made a new transformer with different ferrite ring higher inductance runs much better
just a bit warm, then i discovered the wave form has overshoot bad, so a bit of reading said i should place a...
Ok I am getting somewhere now its the transformer only runs a bit warm now but have overshoot on the wave form needs a damping resistor where would that go?
My signal generator has variable voltage output tried 12v drive voltage even did totem pole transistors with 12v substituted a larger transistor for the top one still gets hot the only thing have left to try is different transformer and adjust pulse width.
thing is i have to drive it from 5v pwm chip so i might have to boost the voltage thats not a problem i have tested the circuit works fine gives a nice sharp fast turn off and rise time just the transistor issue thats all, and it doesn't get instantly hot takes a thew minutes but ground...
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