12V Timer Circuit for Electromagnet Pulse Every 30-60 Seconds (Battery/Solar Powered)

The discussion focuses on designing a 12V battery or solar-powered timer circuit to activate an electromagnet pulse every 30-60 seconds, intended to strike a gong or chime for meditation purposes. The recommended approach involves using an LM555 timer IC configured in astable mode to generate the timing signal. This output drives a transistor or MOSFET to switch the electromagnet load. Suggested transistors include bipolar junction transistors like 2N2222A, BC546, or 2N3904 for low power, but for higher current and durability, MOSFETs such as IRF510, 2N7000, BS170, or VN10 are preferred. Proper circuit design includes placing a 0.1µF ceramic capacitor across the LM555 power pins and a 10nF capacitor from the voltage control pin to ground to reduce noise and prevent erratic triggering. Additionally, a snubber diode or rectifier across the solenoid coil is advised to protect the switching device from voltage spikes. The power source should supply both the LM555 timer and the electromagnet driver stage. The electromagnet should be strong enough to exert a force comparable to a medical reflex hammer. References to application notes for driving solenoids with FETs and MOSFET selection guides were provided to assist in component choice and circuit robustness.
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