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 * PCB: Send the gerbers from this repo to your fab of choice.
 * ESP12F: Widely available.
 * AM1117 3.3v Regulator: Widely available.
-* QI compatible wireless charging coil delivering 5v and > [500 mA](https://docs.ai-thinker.com/_media/esp8266/docs/esp-12f_product_specification_en.pdf): For example [this](https://nl.aliexpress.com/item/4001154059743.html), search keywords: "pcba receiver module qi".
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+* QI compatible wireless charging coil delivering 5v and > [500 mA](https://docs.ai-thinker.com/_media/esp8266/docs/esp-12f_product_specification_en.pdf): For example [this](https://aliexpress.com/item/4001154059743.html), search keywords: "pcba receiver module qi". Alternatively you could repurpose coils advertised to convert non-QI phones to wireless charging, such as [these](https://www.pearl.de/mtrkw-9811-qi-kompatible-receiver-pads.shtml)*. 
+
+* **NOTE**: Be aware that these 'converter pads' could contain additional circuitry that condition the output for use with specific mobile phones (the pearl.de ones do). Below is a guide to modify the 'pearl' coils to deliver maximum voltage (5v)constantly, instead of switching to low power, 2.5v output when not enough/too much current is drawn.
+
+
+### Modding Coils/pads
+
+If you have soldered all components together and your ESP12f won't boot, you might have to modifiy your charging coil+circuit a bit. To make sure it's the coild, measure the output of the coils electronics on the + and - (gnd) terminals. If your multimeter reads ~2.5 volts you need to modify the circuit. (Disclaimer: the exact details on how this circuit works are yet unclear, comparing to a working coil revealed several differences in the electronics, matching them up made the non working coil output the needed 5v). 
+
+#### Step 1
+
+Take off the follwing chips indicated by the following silkscreen codes:
+* Q3 (chip markings: p7)
+* Q4 (chip markings: wsc7)
+
+A hot air reworking station + tweezers will take quick care that (settings: 1 second on 320deg, modertate airflow). Withouth hotair you could try a soldering iron or fine wirecutters to simply cut away the chips. The flexible PCB is very fragile tho.
+
+##### Step 2
+
+With both chips removed, you have to bridge two of the three (now) bare connections of the transitor Q4. I could not find a datasheet on this transitor so please refer to the photo's to see which pins.
+