Recent content by terramir

  1. terramir

    PWM Without PWM IC

    I understand that the voltage would change when the temperature is changed, there would be a pot that changes the base voltage at STP, but if the temperature rises (with a ptc in series with the rheostat (pot without using third leg)) the resistance on the base would of the shorting transistor...
  2. terramir

    PWM Without PWM IC

    I'm not sure you exactly know what I mean I would be shorting very little current to 0V  Maybe this will help envision what I had in mind Mind you where the variable resistor is there could be a resistor and a variable resistor as well as a PTC to regulate for temperature. you said something...
  3. terramir

    PWM Without PWM IC

    I was writing up a post on pwm after someone said that pwm didn't regulate voltage, and how before and after the filter capacitor the voltage is either 12 or 0V before but let's say 8V afterwards. This gave me an idea about a adjustable voltage regulator that would work sort of like this the...
  4. terramir

    Creating a cheaply built (mostly out of slaughtered parts) mppt

    Not looking for pwm  :( pwm wastes energy nothing else Matter of fact used one of them screwed up my lead acid batteries! Also I'm not trying to lose power here but gain it. There is a theoretical possiblility of using pwm and create a second rail that catches all the pwm dropouts and op-amps em...
  5. terramir

    Child's Pinball Machine Project...HELP NEEDED, PLEEEEEASE

    first dun cut any wires just yet, open it up and see what makes it tick, mechanically, and see what bumpers and stuff have switches to make the sounds and stuff. if you can move those switches into the new nice looking bumpers great, then all you need to do is transfer everything and maybe...
  6. terramir

    Creating a cheaply built (mostly out of slaughtered parts) mppt

    What I need is a circuit That will transfrom my 17V DC into something with quite a bit of frequency, I know if it's a capacitor based solution I might end up with higher voltage spikes, but on the output end I can smooth things out with capacitors again :P so I can feed it through a transformer...
  7. terramir

    Relays that stay ? is there such a thing?

    well I was actually hoping for a relay that has leads for each switch position (i mean trigger leads) but bi-stable relays could work too I'm gonna search online for some now :) thanks any more info would be appriciated terramir
  8. terramir

    Relays that stay ? is there such a thing?

    ??? My question to the community is the following is there such thing as a relay that will stay in either in switch 1 or switch position 2 without constant current needing to be applied to either one or two. I mean usually a relay stays in the switch one position and lets current through to one...
  9. terramir

    anyone got some ideas for me on these three problems Charger and monitor circuit

    1-5 will be on another pin because that voltage will be measured constantly while the individual cells will only be measured during charging, and only as a spot check during discharge. discharging monitoring the main 1-5 is far more important and the cells then are only checked at certain levels...
  10. terramir

    anyone got some ideas for me on these three problems Charger and monitor circuit

    First I need a voltage divider I know that is two resistors but I’m a little unclear on how that would be wired to an adc Second I need a circuit that can measure charging current based on an adc while it’s still isolated from the adc I can’t have the 1 amp going to the adc pin, but I can’t...
  11. terramir

    Hello Newbie questions

    well I needed to build some li-ion chargers, I got the cells and well I got some surface mount Grrrr :'( darn chips (samples so no big loss), I looked at them and unless I spend like 150 bucks it's not realizable. for the adapter for the prototyping and then well afterwards to have then throw on...
  12. terramir

    Hello Newbie questions

    Hi guys I'm an advanced computer builder, but I got the small problem in electronics I'm a complete and utter novice, I want to learn how to program and design curcuits based on pic processors, but there are so many factors to consider, I really need some recomendations on how to learn this...
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