Recent content by anthonyjames9

vk6kro, i've tried changing the limit on the power supply, and tried a different power supply, it doesn't seem to make a difference. I'll try putting the resistor straight across the supply. schip666!, My first thought was to try the protection diode, but it stopped the transfer...

I tried with the resistor and it behaved the same. Any further ideas?

Thanks for your help. I'll try that when I get back to the lab tomorrow to see what I find out.

Ay the input to the gate the signal has a small oscillation at the rising edge but settles fairly quickly. I've measured the period and it appears to be correct. The MOSFET is running off 15V and the 555 is going through a 5V regulator, I tried two separate supplies but it made no difference...

I haven't got C1 in my circuit, sorry. I hope that's not the reason for my error?

Thanks for your quick reply, the circuit is like that. It's 9.53uH, and yes I do have access to a scope.

I've currently using a signal generator into the gate of a MOSFET to switch an inductive load. I've built a 555 circuit to replicate the signal generator output (TTL 5V 192kHz). When I connect this to the gate, the power supply driving the MOSFET limits the current and shuts itself down...

Thanks for your reply again. The post you linked to is actually one I created a while back when I was looking for initial help. Through discussion with various people it was deemed that the Colpitts (or similar) weren't stable enough and a much more reliable method for this purpose would be a...

Thanks for your replies guys. I'm trying to create a small wireless induction circuit, I've managed to use a signal generator to create the 500kHz signal, but obviously it's not capable of driving much current. Maybe AC was the wrong word, but more "Choppy DC". I was hoping the 555 would act...

Hey guys, I'm attempting to use this chip, http://www.national.com/pf/LM/LMD18200.html#Diagrams with a simple 555 circuit as the input to drive an AC signal out. From my understanding I can have the 555 going into the PWM input, a relatively high current connection to Vs, this will then...

Thanks for the advice guys, I'm in Europe so I'll check the rules here. If I tune the circuit to around 500kHz I might not have a problem anyway. Is there any way of boosting the output power from the signal generator for the purpose of testing at least? I've been told power Mosfets...

I've attached an image of the circuit (photo.jpg). When I place an Ammeter in series, even when putting a resistor (tried values from 10Ω to 1kΩ) I don't get any reading on the meter. I suppose what I think I'd like to come up with eventually is seen in the second attachment (photo2.jpg)...

One coil is 5cm by 2.5cm with 32 turns of 0.711m diameter copper. The other is 2cm by 1cm with 16 turns. The voltage output is 20Vp-p with it failing to drive even 10mA out of it (although it doesn't specify anywhere it's actual limitation - not that I can see anyway). Thanks for the tips on...

Hey guys, I'm designing a wireless charging system, and I've managed to take some measurements between two coils for the voltage transfer, but the signal generator I'm using doesn't seem to output any measurable current. What could I do to it, or what could I design from scratch that...

Thanks for a quick reply, is there one you could possibly recommend?