Before the damped sinewave you can expect various truncated pulses to the same amplitude caused by contact bounce. To further complicate the issue the inductance will vary with how close the clapper arm is to the pole piece. its inertia and the restoring spring force. It will electrically 'ring' with a decaying exponential amplitude envelope sinewave, initial amplitude set by the stored energy in the coil, its inductance and the effective stray capacitance across it (including a contribution from inter-layer capacitances across parts of the coil), at a frequency set by the inductance and the stray capacitance, at a repetition rate determined by the clapper mechanics, e.g. If you have problems with interference, they can be cleaned up with a snubber network (an RC circuit in parallel with the bell) and ferrite beads. To start with, just connect a reverse parallel diode in parallel with the bell, to suppress the high voltage produced, if the transistor interrupts the current, whilst the electromagnet in the bell is turned on.
Qucs arduino simulator#
It's possible the spurious RF emissions could interfere with other the microcontroller, but it isn't something a simulator will be able to predict. The arc will also produce much higher frequencies, up to the microwave range and beyond, which can cause more trouble. An arc will form across the contacts and the RLC circuit will ring, probably at a frequency between a few 10s to 100s of kHz. The inductance will probably dominate first, causing the current to initially be quite low, gradually rising, until the clapper hits the bell and the contacts open. The electromagnet is an inductor, with a certain internal resistance and capacitance, forming an RLC circuit.
Qucs arduino series#
When the bell is first turned on, the clapper will be away from the bell and the contacts in series with the electromagnet will be closed. There will be ringing, but not at the audio frequency produced by the bell. There are plenty of circuits which will work in simulation, but not real life and vice versa. Have you had any problems with the circuit? Simulation can't tell you everything. And here's the wikipedia diagram ( ) explaining the theory.
(I can post the part numbers of the transistors I was thinking about using if that'll help.)) How do I simulate this in QUCS? As a relay in series with an inductor and then in series with itself? If I am supposed to use the 'relay' part in QUCS for this, how do I measure/figure out the hysteresis voltage of the part I have? (I have a good multimeter, LCR meter, and scope.) Here's some pictures I found on the web that look like the device I have: enclosed, ( ) open ( ). I have an electric bell, which I would like to trigger from a couple of transistors (a smallish npn transistor switching on a larger pnp transistor switching the bell directly, with an arduino switching on the smaller first transistor.
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