![]() I tried an IC socket but it was actually worse than the breadboard for holding the relay.Ĭonnect the Emitter of the BC547 transistor to pin 2 on the side nearest the battery terminal. It uses a pulse to move the switch, then stays in position, slightly reducing the electric power requirement." What I have done here and what I recommend is to mark the sides of the relay to indicate where the pins are because once placed on the board you can no longer see them.įirst let's place the connectors for the relay, due to its small pins you will have a hard time keeping the relay in the breadboard so using the female breakaway round header pins works very well. ![]() The latching part is what makes this a perfect relay for this project, "Most relays require a small continuous voltage to stay on. So this is a double throw, double pole, latching relay. Just be very careful taking the pack apart, avoid short-circuiting them. The best way to get these batteries is a laptop battery pack headed for recycling, you can get up to 6 individual cells, at least 1 of which will still be good. On Amazon, the shipping is free but the battery cost is really high. Banggood seems to be middle of the road, batteries are more expensive but shipping is reasonable. The 18650 batteries are cheapest on AliExpress but really pay attention to the shipping costs, some are horrendously high.
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