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It is indeed possible to change AC to DC, and it is done all the time. You can do it electromechanically by connecting a the shaft of a DC motor to an AC generator (called an alternator). Or, you can use electronic switching circuitry to change DC to AC in a circuit called a power inverter. Some small examples include small inverters that convert +12 volts from a car battery to power up 120 Volt AC devices. Very large high voltage power inverters are used to convert high voltage DC (HVDC) power to high voltage AC within many large national electrical power systems in the US and Europe. Google "power inverter" or "HVDC" to see some examples of DC to AC power conversion.
Bert
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: Just curious, how is it possible to change dc to ac. YOu can only change ac
: to dc.
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: Is there a way to create a circuit that can do this?
: I was told that a step-up transformer was required but I can't see one
: listed anywhere.
: thanks.
: :
: Hi Mike,
: It is indeed possible, but it takes more than just a transformer. For
: example, most stun guns use an oscillator (called an inverter) to
: transform the battery's DC voltage to an AC voltage which then drives a
: small step-up transformer. The output is changed back to DC in order to
: charge an electrolytic energy storage capacitor to a moderately high
: voltage (say 350-450 volts). The inverter circuit is similar to the
: charging circuit used in an electronic flash circuit for cameras. The
: fully charged capacitor is then suddenly discharged into the primary of
: another high voltage step-up transformer (called a pulse transformer)
: using a transistor or SCR switch. This generates a high voltage pulse on
: the output of the HV transformer. Most stun guns output tens of
: thousands of volts - an any ads indicating 300-500 kV handheld units are
: simply advertising garbage.
: However, by using a large capacitor and a suitably designed oil immersed
: HV pulse transformer or a high performance ignition coil (HEI, Accel,
: Malory), 100,000 volts can easily be achieved from a small 9 volt
: battery. The output will not be a steady 100,000 volts, but instead will
: be in the form of high voltage pulses or spikes. And the pulses may only
: occur every 5-20 seconds since the HV capacitor must be recharged
: between shots.
: Be aware that many communities have made stun guns or stun devices
: illegal. And please remember that high energy pulse circuits have the
: capability to severely shock or even kill you. So, if you are not
: familiar with high voltage and electronic design, do NOT make this your
: first (or your last?) electronics project.
: Following is a site that shows some schematics for a number of styles:
: http://www.stun-gun-reviews.com/stun-gun-schematics.html
: Best regards,
: -- Bert --
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