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Type: Posts; User: dom444

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  1. Closed: Re: PIC16F73 based 50A PWM 12v-24v-48v auto solar charge controller with HEX and PCB

    I am building your charge controller but what is the resistance of the shunt and what is the unmarked component that is on the BAT+ pad

    Thanks
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    Closed: Re: Very Sensative AC finder circuit my design

    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...
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    Closed: Re: Very Sensative AC finder circuit my design

    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...
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    Closed: Re: Very Sensative AC finder circuit my design

    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...
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    Closed: Re: Very Sensative AC finder circuit my design

    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...
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    Closed: Re: Very Sensative AC finder circuit my design

    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...
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    Closed: Re: Very Sensative AC finder circuit my design

    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...
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    Closed: Very Sensative AC finder circuit my design

    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...
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    Closed: Re: All Transistor HV Neon Supply (simple)

    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...
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    Closed: All Transistor HV Neon Supply (simple)

    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...
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    Closed: Re: pulse transformer fet drive problem

    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...
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    Closed: Re: pulse transformer fet drive problem

    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?
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    Closed: Re: pulse transformer fet drive problem

    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...
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    Closed: Re: pulse transformer fet drive problem

    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...
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    Closed: Re: pulse transformer fet drive problem

    the reason i am looking at this circuit is that the drive transistor circuit makes it flexible on the transformer you use.

    ...
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    Closed: Re: pulse transformer fet drive problem

    just using signal generator at the moment 20khz square wave
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    Closed: pulse transformer fet drive problem

    I am testing this gate drive pulse transformer circuit but the top 2n2222 connected to positive rail runs hot the ground one runs cool should they not have used higher current transistors to drive s...
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    Closed: Re: Sinewave inverter prototype...

    I was wondering did you end up getting the circuit in #161 working properly I like the idea of all discrete components and only one IC ?

    thanks
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    Closed: Simple Geiger Counter Circuit

    https://youtu.be/7vD4qKOYPVYHere is my Geiger counter circuit easy to make using cheap Russian Geiger tube not very sensitive to alpha radiation
    http://sendvid.com/3cikwtub but good for checking...
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    Closed: Re: Sinewave inverter prototype.

    Thank you I will try it out
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    Closed: Re: Sinewave inverter prototype.

    does anyone have fuse settings for atmega8 please?
  22. Closed: Universal PWM sine 50/60 HZ full bridge driver moduale

    After looking for a true sine wave pwm inverter circuit suitable to build I came across very little helpful information and some teasers of micro chip 50/60hz pwm programs that don't work or are not...
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