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--- en:elektronik:wechsellichtschranke [2023-05-27 12:11] – created rainer
+++ en:elektronik:wechsellichtschranke [2024-09-29 07:35] (current) – R1 optional; typo rainer
@@ Line 1: / Line 1: @@
 ====== Proximity Sensor with PLL-IC ======
@@ Line 6: / Line 4: @@
-{{:elektronik:wechsellichtschranke.svg|}}
+{{:elektronik:wechsellichtschranke.svg?736|}}
+R2 determines the sensitivity;
+if too large, strong stray light may overdrive the sensor.
+R3 and C4 determine the frequency and need only be changed if stray light of the same frequency is very strong.
+Q1 is the LED driver and delivers the signal in the right phase; R4 determines the current through the LED.
+The output at pin 8 is an open collector transistor switched on if the PLL locks, i.e. reflecting surface or not disrupted.
+It can drive 100mA (on) and withstand 15V (off); the resistor R1 is shown only for convenience.