I have a couple 1N4729A 3.6V, 1W zener diodes. Will these work with a 20 MHz clock? I didn't even think about the low power requirement when I bought them.
Thanks,
Roger
Zener diode suitability
can anyone take a look at the circuit of PowerSwitch? http://www.obdev.at/products/avrusb/powerswitch.html
I tried to change the circuit to run with red LEDs instead of Zeners.
I'm using an atmega8 controller running with 5V @ 16 Mhz (quarz).
Where do I have to place the LEDs to work in that circuit? Do I have to change the resistors from pull-up to pull-down and do I have to edit the code either?
thank you in advance,
bye
I tried to change the circuit to run with red LEDs instead of Zeners.
I'm using an atmega8 controller running with 5V @ 16 Mhz (quarz).
Where do I have to place the LEDs to work in that circuit? Do I have to change the resistors from pull-up to pull-down and do I have to edit the code either?
thank you in advance,
bye
finally
I've tested it with two red LEDs in series from DATA+ to GND and two LEDs from DATA- to GND. That works fine.
The other solution was the method showed on the circuit of the USB-AVR home page with two normal diodes in series to reduce the voltage of the whole circuit to ~3.6 V.
http://www.obdev.at/Images/avrusb/circuit-zoomed.gif
My device didn't work earlier, because my hex-file was broken
thank you,
bye.
I've tested it with two red LEDs in series from DATA+ to GND and two LEDs from DATA- to GND. That works fine.
The other solution was the method showed on the circuit of the USB-AVR home page with two normal diodes in series to reduce the voltage of the whole circuit to ~3.6 V.
http://www.obdev.at/Images/avrusb/circuit-zoomed.gif
My device didn't work earlier, because my hex-file was broken
thank you,
bye.