I have recently drawn out a simple printed circuit board, to understand an old Uniross Ni-Cd rechargeable torch.
I have recreated the flasher circuit onto a breadboard and connected it to the torch head - where it flashes about once a second, with the pcb disconnected.
However, trying this breadboard circuit with apparently similar bulbs I have it just lights the bulb without flashing.
At first I thought I wonder if the torch head - which is glued together and likely difficult to disassemble - has another component inside. Or is the circuit quite well designed to the bulb's resistance?
I have as yet [not] figured out the circuit's operation - any ideas?
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