Sorry for the delay, guys. For some reason Yahoo keeps dropping my login and I don't get the emails, either. If someone wants faster service, send me a direct...
Thanks for your reply but I built the circuit and it never turned off. It seemed that the fet continues to be powered through the 1K resistor 8 which is...
Hi everyone anybody know anything about mobile phone detector I'm doing project on that. I'm using radio frequency detector & Schottky Diode but not getting...
I made the lightning detector as described in our circuit diagram. I connected the "LED circuit" to the "lightning detector version 2". When I swithched ON the...
I'm not sure which is 'version 2'. If you mean the older one with the potentiometer, you should disconnect the antenna and adjust the pot until the flashing...
Do you have its FCC ID? It would be interesting to see what spec it was tested to. ... From: charleswenzel <charles@...> Subject: [techlibdotcom] VLF...
I meant the first circuit(without potentiometer) as "version 2" cicuit. Sorry for it.Can you explain the reason for the first circuit? I heard that there is...
Here's a big photo of the beast: http://www.techlib.com/DSCN0564.JPG It looks like a 900 MHz system but I'm hearing noise at VLF. My latest theory is that the...
That circuit shouldn't flash without a signal. If you disconnect the antenna does it still flash? Have you tried batteries just to see if it is the supply? The...
You're right, "meter data access over the UtiliNet frequency hopping spread spectrum (FHSS) fixed mesh network. The network operates in the 900MHz ISM band...
Thank you very much for your help. My purpose is to design a lightning detector which interrupts the PIC microcontroller when lightning strikes. For this...
I connected the "LED circuit" to the "Lightning detector Circuit". The LED is always flashing because Q1(2N4401) is forward biased(V BE =0.56V) even 0.001uF is...
... Are you one one of the larger investor owned utilities (IOUs)? I use to work in the utility industry (actually ran the metering department in one about 15...
That transistor should be biased at all times. It just amplifies the RF signal. That signal is coupled through the 120 pF capacitor to the flasher circuit....
No, it's city owned. Also, I'm not a ham. To be fair, I don't get the impression that the city doesn't care. I'm not sure they can easily fix the problem and...
Thanks for finding that. That was an interesting read. I'm more convinced that it must be the power supply. 300 uV is nothing to sneeze at when the antenna...
I removed 120pf but still LED is flashing. Voltages of 120pf pins are 3.36V and 0V w.r.t. ground. This means Q2 and Q3 are in OFF mode. Therefore Im assuming...
I would fuse the line to neutral/ground caps. They could cause a lot of trouble before blowing the 200 amp main breaker. I'm not sure where you are going with...
If they're bonded at this panel then I don't need the cap. I haven't pulled that cover off. I'll leave that to the electrician. Come to think of it, there is a...
The circuit should not be able to flash with the 120 pF disconnected so there must be a problem with the circuit or a component. The LED and resistor to plus...
Oh sorry, I missed that your were going to add breakers for the caps, I thought that referred to the "big one". ... From: charleswenzel <charles@...> ...
I think you are correct because Voltage at emitter is (2.6V wrt ground) greater than Voltage at Base(1.2V wrt ground).Without a trigger pulse from the 120 pF,...
I think you are correct because Voltage at emitter is (2.6V wrt ground) greater than Voltage at Base(1.2V wrt ground).Without a trigger pulse from the 120 pF,...
It's all based on the way the emissions are measured with the regulatory testing procedure. I suspect there is some type of integrating involved such that the...
