Very true in theory but I cannot recall seeing this done for bicolour leds,possibly because most circuitry with less are on a 5 v rail.I will use two resistors as you can vary their value to suit the differences in brightness between red and green.? Cheers.
M0IDR
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Saving one resistor you will need two diodes in series with both RX and TX line to prevent the
voltage at the common point to go back through the LEDs from RX to TX power lines and vice-versa.
The Voltage across the dropping resistor will be 9-10V.
I looked a random LED spec sheet and it had reverse voltage of 5V..
Raj
At 17/10/2018, you wrote:
Very true and saves a resistor,however the little pcb supplied with the metal case is wired for two anode resistors.Just personal choice I guess to achieve the same thing.? 73. M0IDR
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From: [email protected] <[email protected]> on behalf of Ion Petroianu, VA3NOI <ion.petroianu@...>
Sent: Wednesday, October 17, 2018 12:15:36 PM
To: [email protected]
Subject: Re: [BITX20] How to connect a TX-RX LED to the BITX40 ?
?
Or, one can connect the anodes direct to RX/TX lines and use a single resistor from cathode to GND.
Ion
VA3NOI
