Editing Basic Circuit Building Blocks
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*H Bridge | *H Bridge | ||
− | An H bridge is an electronic circuit that causes current to flow in one direction or the other ( from a | + | An H bridge is an electronic circuit that causes current to flow in one direction or the other ( from a singel ended power supply ). Often used for motor control [[motor driver]]. |
It is an electronic double pole double throw switch. | It is an electronic double pole double throw switch. | ||
**[http://code.rancidbacon.com/Electronics] See Section on ''H-Bridge'' | **[http://code.rancidbacon.com/Electronics] See Section on ''H-Bridge'' | ||
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This high side switch usually requires the base voltage of Q to be VPLUS_VDD plus the turn-on voltage of the transistor to turn all the way on. Another approach to the high side switch that requires a lower turn-on voltage is to use a PNP transistor as the switch. The base of the PNP is pulled up to VPLUS_VDD and connected to the collector of a small signal NPN transistor, Q2. Q2's emitter is connected to ground and its base is connected to the input signal through a current limiting resistor -- now the problem is that a high voltage is required to turn the switch off. | This high side switch usually requires the base voltage of Q to be VPLUS_VDD plus the turn-on voltage of the transistor to turn all the way on. Another approach to the high side switch that requires a lower turn-on voltage is to use a PNP transistor as the switch. The base of the PNP is pulled up to VPLUS_VDD and connected to the collector of a small signal NPN transistor, Q2. Q2's emitter is connected to ground and its base is connected to the input signal through a current limiting resistor -- now the problem is that a high voltage is required to turn the switch off. | ||
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== Transistor Emitter Follower == | == Transistor Emitter Follower == |