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Get this and other widgets at roytanck.com
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DIY V-Boost Controller:What I found while screwing around with the V-Boost controller was that it does not look at voltage amplitude or current to control the servo. Because of this, a simple IC 555 timing chip can provide timing signals to the controller. Although I do not have the time to design the circuit right now, I will point you in the right direction for parts. I am working from memory here so don't go thinking this is absolute: At 8000 RPM, the V-Boost butterfly goes wide open. The frequency at the input is 133 Hz. If you want to look at other RPM, the input to the module can be calculated with the following spreadsheet: (MS Excel required)
Components for a Wide Open Signal Generator:You may want to start with a simple timing generator the move up to the adjustable timing generator. This unit will generate the 133 Hz signal to trick the V-Boost controller to open the V-Boost butterflies:
IC 555 Pin out:
This setup will produce a 133.33 Hz signal with a duty cycle of 87.9% Once you build the above circuit, you will need to add a double pole switch to select stock V-Boost settings or open the v-boost with the handy 555 timer circuit. Wire the common to the v-boost controller input from the timing box. Wire the original input to one pole and wire the other input to the 555 circuit. This will select what the controller is looking at; the ignition box or your timer.
Components for adjustable V-Boost:Input diode: the timing signal present at the controller is on the yellow wire. This signal is at 13.3 volts and drops to 0 volts at each timing pulse. Install a diode that will limit the reverse flow back into the bike timing circuit and hold the RC network charge. RC Circuit: An RC circuit will "sum" the input timing pulses from the bike to a steady voltage level that rises and falls with the timing frequency. You can control the rate of charge of this circuit with a Potentiometer. Remember, the signal is a high to low transition and the RC circuit will work in reverse, it will go more negative as timing frequency increases. Inverter: Since the timing signal is a high to low pulse, you may have to reverse the RC network output with a 1:1 inverted OP Amp prior to using it as an adjusting input to the IC 555 Pin 5. The Timer: Once you decide the base frequency for the timer via the RC network established on Pin 4, 6 and 7, the timer can be controlled by varying the input voltage on Pin 5 from the input RC network. My guess will be the following values: R1 = 1k ohm, R2 = 10K ohm, C1 = 1m farad. This would also vary with the input timing change. Here is a good link to learning about IC 555. Power Supply: Its best to install a 7812 as a power supply for VCC. This is a single chip 12 volt power supply that is very easy to use. This is all of the time I have for right now. One of the days I will build the circuit on a bread board and test it. Then I will make a materials list and PDF file of the circuit you can etch onto a copper clad board. These etch kits can also be purchased at Radio Shack.
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