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HBridge Amplifiers
HBridges make efficient amplifiers because they apply voltage in both directions across the speaker, relative to class A or class B amplifier circuits. There is a price to pay, of course, in complexity, but since motor control via FETs is such a common application these days, parts and examples can be easy to find.
There are many resources for HBridge design on the internet. There are some of the most useful when designing amplifiers for Electric Eels
Making a full H-Bridge from FETs requires the use of a "High-Side Driver." It's an 8-pin chip that takes care of some "chores" associated with making FET H-Bridges:
1. It prevents it from shorting itself out.
HBridge Developer's Board
Some nicely-specced MOSFETS
Info on MOSFETS
Info on High-Side Drivers
Evaluating High Side Drivers
Experimental Combination
Based on the FAN7390 Chip
One popular, affordable chip to work with is the FAN7390. It comes in DIP or SMD so you can prototype on a breadboard.
Reference Circuits for FAN7390
-Includes sample values for Rboot, Cboot, R1, R2 and R5.
-Includes the following schematic:
-Includes the following schematic:
FET Shopping
These FETs have low on-resistance relative to the amount of power they pass through:
These FETS were under consideration, too.
General HBridge Design Examples
Bob Blick's HBridge Circuit
In 1998, Bob Blick posted a schematic for an HBridge circuit. I'm looking into this design to see how it might be useful for Exertion Instruments. If anyone could check this schematic over, please let me know in the comments section.
BobBlick 11.sch BobBlick 11.sch (Eagle Files)
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