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120v fan controller
What kind of motor is it?
- 3 phase?
- single phase?
- single fase with fase lag capacitor?
- power?
frequency control is the best way.
48vdc to 12vdc circuit
ok. In that case you can use the circuit of IanP, but it dissipates a lot. (~3.6W for the resistor and max 1.2W for the zener) However it is a very low cost and simple solution. (you have to change the resistor for ~360 Ohm)
An other solution could be a SMPS. High...
AT Mega16 is ok.
Make good emc design and use of the watchdog. But if you write good code the controller should not hang.
Take care of stable powersupply, filtered inputs / outputs etc, brownout detector.
Re: inverter
take a look at irf.com
or
semikron.com
They have all kinds of drive electronics: H-bridges, drivers and a lot of documentation.
see also:
**broken link removed**
**broken link removed**
led rc lighting systems
I have found a lot of Power leds at the Farnell site. All with a Vforward <6V.
For the tail flash light you can search for ic's also used in photo cameras and telephone photo cameras. They are high power/ small / lightweight.
I know one way to supress the noise: Stop (set in sleep) the microcontroller if you do the AD conversion. There are some controllers which can do that.
I can find them back if you want.
As soon as you put a little voltage on these pins the led in the opto will turn on.
A fluorescent tube can't be dimmed from 0% to ~20%. So from ~20% the lamp can work this is exactly the voltage you need to get the optocoupler LED light.
So just put a voltage from 0-10V at the J5-pin3 and...
Re: Blend Effect
R12 / R13 makes a gnd so you have a symetrical powersupply out of one battery. C12 is to stabilize the powersupply and to make it low impedant for AC currents.
The opamp is configured as a summator (blender...) with a little amplification. It adds the signals of in1 and in2...
you control the dimming by a voltage 0->10V.
0v = lamp of
5v = lamp 50% on
10v = lamp 100% on
The opto iso4 to PE2 can be used (but is not clear in the documentation of Atmel) to detect if one will control the lamp by 0-10V.
If you have the software you can find out where PE2 is exactly used for.
PWM is just on/off. Turn the LED on and the transistor will conduct.
The transfer ratio of an optocoupler is not linear. There are special optocouplers for analog signals but they are more expensive. So this looks like a strange solution but is very low cost to build.
The signal out of the...
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