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Post by eddy99 on Jan 15, 2011 9:43:35 GMT
Hi, is there a easy way to convert the 5 volt output on the function decoder to 9 volt ??
cheers eddy
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Post by Paul Harman on Jan 17, 2011 12:25:01 GMT
Eddy
You will need to use a high current version, and put a 9V regulator on the blue wire to take the track voltage down to 9V.
If you are making an 8-output version there should be enough room on the board to put a 78L05 regulator on there which will give you up to 100mA.
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Post by eddy99 on Jan 17, 2011 13:51:05 GMT
Hi Paul, I have only made the low power versions @ 5V, are the high power versions 9V plus ? Or am missing something  Eddy |
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Post by Paul Harman on Jan 17, 2011 16:05:29 GMT
The high power versions have the outputs at track voltage just like a decoder you buy from the shops.
The outputs are open collector, and the blue wire is positive. You modify the voltage on the output by regulating the supply from the blue wire if you want a voltage lower than the track voltage.
The low power versions have very different outputs and are ideal for driving LED lighting at constant brightness, but are no good for high power applications like bulbs and motors.
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Post by eddy99 on Jan 17, 2011 16:39:57 GMT
Thanks all clear now, just need more volts to drive some 12v led strip lighting
Eddy
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Post by Paul Harman on Jan 18, 2011 9:34:14 GMT
Just make a high power decoder. The 12V LED lighting will run OK from the track voltage, just use a series resistor if it is too bright.
Don't forget that the outputs of a high power decoder just have a 4K7 resistor and a transistor added to increase the power, and bigger diodes to supply extra current to the blue wire. There is not much difference.
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Post by eddy99 on Jan 18, 2011 12:48:16 GMT
I must be doing something wrong, tried modding a low power one but still only 5-7v.
Looking top down I connected 1N4148 across the left and right legs of the REG.
Jumper wire from right leg of REG to right leg of transistor.
Left leg of transistor to 4k7R to A output of PIC.
Center pin of transistor to stripboard output
Output should be track power +v blue wire (track 5 of stripboard counting track 1=REG), 0v center pin of transistor which is through stripboard ??
Eddy
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Post by Paul Harman on Jan 19, 2011 0:05:35 GMT
Jumper wire to the transistor should come from the MIDDLE leg of the regulator. That should get you a few more volts on the output!
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Post by eddy99 on Jan 19, 2011 11:45:46 GMT
Sorted thanks
Eddy
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