![]() ![]() The frequency is set by the value of the primary inductance of your chosen coil pack or ignition coil, the impedance of the relay coil, the value of the capacitor, and the time taken for the contacts to close.Īs can be seen, this circuit will result in large current pulses through the NO contacts as the energy of the capacitor is dissipated there, and large voltage spikes on the primary on the NC contacts, accelerating corrosion and damage.ĭespite causing damage to the relay, this circuit is fun to play with, and is a quick an dirty way to test coil packs and ignition coils. Doing so causes the relay to disengage and another "ping" to this resonant tank circuit, continuing the oscillation. When the voltage across the capacitor reaches a high enough value, the relay engages, shorting the capacitor. This is the start of "ringing" due to the action of the capacitor and inductance of the coil. Upon the application of a power supply, current briefly flows through the capacitor and coil. Do not power this circuit with lithium ion batteries or an expensive supply. Adding a large (1000uF+) of capacitors is needed to minimize stress to the power supply. The power supply must also be capable of maintaining constant voltage at the frequency of operation. T his circuit will inevitably destroy any relay, due to arcing at the contacts accelerating corrosion and excessive heat eventually melting the relay. ![]() Note: be sure to use high current capable relays, automotive relays are a good choice. and makes cool plasma globes out of light bulbs. this makes VERY small streamers due to its frequency. This is my schematic its easy, but it, with my power source, only makes about 20 KV (1 inch arc) at a low fixed freq. ![]()
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