Hey Charles I made the circuit very well and the trip off voltage is fine but the hysterisis is not working well. For low battery voltage shutdown it shuts...
I suspect the values of the feedback resistors are too high but you should see some hysterisis. If you don't see any at all, check the voltage on both ends of...
Thank you so much Charles, but as you know am not a genius in electronic so some terms beat me like I dont understand the term swinging from rail to rail. Also...
Thank you so much Charles, but as you know am not a genius in electronic so some terms beat me like I dont understand the term swinging from rail to rail. Also...
"Rail to rail" is just slang for swinging from the lowest power supply voltage to the highest or 0 to 12 in your case. The swing will be a little less since...
Hey Charles, since this circuit is proving to be a problem to me, I have decided to work on it one by one. Now am working on the low battery disconnect part of...
There is some interaction of the values for the threshold and the hysterisis. It sounds like you have too much feedback since the window is 14 - 10.5 = 3.5 and...
Thank you so much Mr.Charles, I have made the corrections and the circuit has worked pefectly well. Now am on step two i want to make the overvoltage...
I would recommend a little hysterisis; just increase the feedback resistor. The first circuit I posted shows the bottom op-amp disconnecting the load when the...
Yes, I'm moving that part to the front end between the charger and the battery. Originally I thought you wanted to disconnect the load from the battery. ... ...
hello,, i've build referigerator alarm that the schematic diagram found in http://www.techlib.com/electronics/kitchen.html. it works but the alarm sounds very...
Sure, you can lower that resistor quite a bit, maybe to 10k. It is there to limit the current in the event the cell drops very low in resistance but 1 megohm...
Nice one, but a bit more subtle, a solenoid and an aerosol = Automated Weight Loss Aroma Therapy ! Get it now before this special TV offer ends! charleswenzel...
At firsrt i wanted it to control the load but now I want it to control the charging of my battery with a solid state switch such as an N-chanel Mosfet. Please...
thank you, but it doesn't work. I have decrease the resistor's value (resistor placed before CDS cell) and the buzzer voltage just only increase about...
oh i forgot to tell. i replaced the CDS cell with photodiode which had vey high resistance in dark and very low resistance in light. thank you ... From: laurie...
With the circuit like the diagram on the webpage (10K in series with the CdS) does the buzzer sound if you short out the CdS? In other words connect the 10k...
I haven't forgotten you but it's been busy here. I'll try to sketch up what I described this weekend. ... control the charging of my battery with a solid state...
A typical reverse-biased silicon photodiode might only give a microampere or so in a relatively dark fridge and that isn't high enough to drive the darlington...
Thanks so much , am waiting. Dennis charleswenzel <charles@...> wrote: I haven't forgotten you but it's been busy here. I'll try to sketch up what I...
I'd like to build a small laser snooper device for demonstrational purposes. The circuit I am interested in is here: http://www.zteck.com/alien/parabolic.htm ...
Sure, or a demonstration a red laser pointer should work great at classroom ranges. The simplest demonstration is a flashlight being shone at a piece of...
I just made a model using the free SwitcherCAD from Linear Technology and it works great. Would you be willing to try the program? If so, I'll put the...
When I was in high school a friend and I did a similar experiment with aluminum foil stretched over a frame, a flashlight, and a biased CdS photocell hooked to...
Thank you so much Charles, I will try out the charger circuit with a P-channel mosfet as you said but P-chanel mosfets are not available on our local market...
An N-channel will work if it is put on the negative line. I'll redraw the simulation schematic sometime this week when time permits, perhaps tonight. ... a...
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