TOTeM PD

[ionios]

Here are some photo from my totem,




I start to build it in a different case but it was not enough space in there,
I also have a question for Qiaozhi,
At the circuit of totem there are two led one red and one yellow,
Normaly the led we use are 20-25 mA, so they are not good,
We have to use led at list 150mA,
Or we have to change the two resistors especially the 47 ohm with much bigger value.
Thank you.

[Qiaozhi]

Originally Posted by ionios

At the circuit of totem there are two led one red and one yellow,
Normaly the led we use are 20-25 mA, so they are not good,
We have to use led at list 150mA,
Or we have to change the two resistors especially the 47 ohm with much bigger value.
Thank you.

You would be correct if the output was at a constant DC level, but in this case the outputs are pulsed (RED LED) and alternating (YELLOW LED). To double check, I looked inside the prototype TOTeM unit, and the values are definitely 100R and 47R. The LEDs are normal brightness when illuminated, and both are the normal 20-25mA types.

[ionios]

So must be something wrong,
The yellow led after the 47 ohm resistor get burn.
i will check it again.
thank you.

[Qiaozhi]

Originally Posted by ionios

So must be something wrong,
The yellow led after the 47 ohm resistor get burn.
i will check it again.
thank you.

In operation, the yellow LED is not very bright, and the red LED is always the brightest.
In fact, the yellow LED is not very useful, so you can leave it disconnected until you find the source of the problem.

[ionios]

Ok thank you.