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- Joined
- Jan 21, 2010
- Messages
- 25,510
Check here.
Anything in the E24 series should be easy to get. I tend to work with E12 values unless there's a pressing reason to use something else -- they're almost guaranteed to be available in any style of resistor you want. There's a reason I chose the values I did
Anything in the E24 series should be easy to get. I tend to work with E12 values unless there's a pressing reason to use something else -- they're almost guaranteed to be available in any style of resistor you want. There's a reason I chose the values I did
Warm. not hot enough to burn your finger. I know I still need a heat sink.
Forgot to add a diode. What diode should I use? Does the diode go across the leads or inline on one leg?
Mosfet is irf510
No clue about the current draw.
The noid is running.
Btw Found out I needed 32hz@70%duty
Forgot to add a diode. What diode should I use? Does the diode go across the leads or inline on one leg?
Mosfet is irf510
No clue about the current draw.
The noid is running.
Btw Found out I needed 32hz@70%duty
Last edited:
- Joined
- Jan 21, 2010
- Messages
- 25,510
The diode should be connected "backwards" across the load. The end with the stripe should be toward the +ve supply rail.
You should be able to get away with a standard rectifier diode. IN4001, for example.
That mosfet looks fine. However, since it is an N channel mosfet, you will need to have a 30% duty cycle with your oscillator, as the mosfet is ON when the output is LOW.
An that's a little more of an issue with a 555 since (without some tricks) the duty cycle can't go below 50%.
can you show us how you connected the mosfet?
The mosfet probably only needs a small heatsink. I would have recommended something with an insulated (or plastic) tab to make it easier to heatsink it without the risk of shorting to the heatsink. And also I would have advised a P channel mosfet.
But given that it's working with a duty cycle of 20% to 30%, I'm pretty sure that it isn't critical. But I would beware that it may not be engaging properly.
You should be able to get away with a standard rectifier diode. IN4001, for example.
That mosfet looks fine. However, since it is an N channel mosfet, you will need to have a 30% duty cycle with your oscillator, as the mosfet is ON when the output is LOW.
An that's a little more of an issue with a 555 since (without some tricks) the duty cycle can't go below 50%.
can you show us how you connected the mosfet?
The mosfet probably only needs a small heatsink. I would have recommended something with an insulated (or plastic) tab to make it easier to heatsink it without the risk of shorting to the heatsink. And also I would have advised a P channel mosfet.
But given that it's working with a duty cycle of 20% to 30%, I'm pretty sure that it isn't critical. But I would beware that it may not be engaging properly.
R1 4700 ohms r2 2400ohms and c1 4.7uf.
Should be 31.6hz @ 74%
Pin 3 from 555 to gate on mosfet
Mosfet drain has a 4001 with the stripe towards the mosfet. (I tried it away and had no out put)
The LED in the foreground is source power the LED in the background is the output
Now that the mosfet is running the load is the duty still 70% or is it different
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