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+====== GCA21 Reverse loop switch for heavy loads (up to 10 Amp). ======
+[[english|{{  rocrail-logo-35.png}}]]
+[[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#interfaces|GCA]]
+  *  [[mgv-overview-en|The GCA Family]]
+ \\
+^^^^By Peter Giling ^^^^
+ \\
+===== This page is under development. =====
+\\
+\\
+===== Description =====
+Bsed on the use of GCA102, which already have been used many times, and still is, \\
+there was a need for something more useful for large current like G-Track or track 1.\\
+Also because of the more and more getting popular use of hall sensors, this unit is provided with connections for only that.\\
+The on-board relays can switch up to 10 Amp, so that would be enough for one train.\\
+The basic idea was to use it together with GCA179 for hall sensors,\ but the plan is going\\
+to change to the option of having connections directly for hall sensors.\\
+Additionally it is possible to use GCA194 current detector to connect to this unit.\\
+Four hall sensors are needed, one sensor at each side of the railcut, and that at both sides of the loop itself.\\
+These pairs of halls ensors could be connected parallel, making less wiring necessary.\\
+The input is made in a way that longer lines are possible, and unlike GCA102, the unit does not\\
+provide extra sensor inputs for use as feed-back for blocks.\\
+This is mainly because the complete unit is powered by the digital rail power itself.\\
+Hall sensors are able to work with max 18 Volts, so an extra regulator IC3 was needed to achieve 12Volt for the free hall sensor circuit.\\
+Because it is important to maintain the position of the relays, (on should always be ON),\\
+the processor stored the last position in eeprom, so when rail power is shortly OFF and comes back ON , the correct situation of relays will reassured.\\
+Instead of using the railpower, it also possible to supply with a 24 V dc (+/- 100 mA).\\
+In that case, do NOT assemble the bridge rectifier B1.\\
+===== Hardware =====
+|  {{:gca:gca21_sch.pdf|Schematic plan}}  |
+|  {{:gca:gca21_pcb.pdf|The pc-board with parts positions}}  |
+This is just a preview, objects are liable to changes!