Thank you Algorytm. In the circuit (pcb) I omitted external power source option since I don't like idea of using poorly filtered mains source to power any device which connects directly to our body. This is fine for CS or light therapy but not here. Just my opinion. When powered from the battery there is no need for 470uF capacitor or LED with 18k resistor. They will only drain battery quicker. One LED on the output (with 4148 in anty parallel) is enough indication that device operates.
I didn't post pcb details last night because I didn't have chance to check for errors yet. Will try later today.
Thanks
Vtech
I didn't post pcb details last night because I didn't have chance to check for errors yet. Will try later today.
Thanks
Vtech
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