Differences

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--- rgb_dimmer [2015/02/22 20:15] – [Recommended LED module and resistors] breaker27
+++ rgb_dimmer [2023/02/28 13:49] – breaker27
@@ Line 76: / Line 76: @@
-For the "max" resistors, you definitely need an extra heat sink at the LED module and resistors which can cope with the higher current (1W).
+With the "max" resistors, you definitely need an extra heat sink at the LED module and resistors which can cope with the higher current (1W).
 Use resistors which can tolerate the power they consume. The power is calculated as:
@@ Line 83: / Line 83: @@
 with U_Res the voltage at the resistor.
+===== Modification of PCB rev. <= 1.1 =====
+The older PCBs have the speaker connected to PD3 (pin5). Since the 16 bit timer has to be used to generate accurate frequencies, you have to connect it instead to PB1 (pin 15).
+The pin to drive the transistor for the blue LED has to be moved from PB1 (pin 15) to PD3 (pin 5).
+In future PCB versions, this shall be changed in the schematic and layout.
+To perform the modification, cut the PCB tracks on the marked positions and connect them to the other pins.