6-transistor H-bridge - This issix transistor "Tilden style" H-bridge; while not as old
asoriginal "basic H-bridge," this goes "way back," and isbasis for many BEAM driver circuits. . . [Wilf Rigter's
A better MOSFET H Bridge Schematic
- Schematic only - no circuit
desciption included. . . [Eugene Blanchard]
A DMOS 3A, 55V, H-Bridge - Application Note. . . [National Semiconductor]
A H-Bridge Design - With a Protection against Having Two Positive Input Pulses. . . . [G.L.
Alternating CW & CCW Motor
Driver - A while back a company
needed a motor controller for a custom door latching system. The system used a small brush motor with a speed
reduction gear to both latch and unlatch the door. When pulsed for about 250ms in the clockwise direction, the
motor would unlatch the door . . . [Circuit by David Johnson P.E., 09/05/10]
AN16 Automotive & Household Siren Driver
Circuits: Zsd100 & Discrete 'H'-Bridge Minimum Parts Count Solution - Zetex Semiconductors Applications Note: A solution is provided that
uses a minimum number of components by utilising an application specific signal generation IC, and a high
efficiency 'H'-bridge effected with 3A DC rated Super-δ TO92 style switching transistors. . . .
AN-694: A DMOS 3A, 55V, H-Bridge: the LMD18200 - Application Note. . . [National Semiconductor]
Better MOSFET H Bridge - Schematic only - no circuit desciption included. . . [Eugene Blanchard]
Comparator Controlled H-Bridge Circuits
(LM311) - Circut three and four are
simple Bi-Polar H-Bridge circuits. The bridges are controlled by a pair of LM311 voltage Comparators. The LM311
Voltage Comparator has several unique features, one of which is an output transistor with an open emitter as well
as the typical open collector. This allows the output transistor of the comparator to sit between the bases of
the power transistors. The LM311 Voltage Comparator also has a STROBE input that will turn off the output
regardless of input conditions. The circuit is shown in two configurations. The first is a typical two input
bridge. The second circuit has a single - duplex input that would be used for model railroad "DCC" control
applications. This page has several circuitsplease scroll down to these. . . [from Rob Paisley's Model Train
Power & Direction of a DC Motor -
TTL type Q and inverted Q inputs control a classic H-bridge circuit, rated at 50 volts and about 10 amps. The
circuit can control power and direction of a DC motor . . . [Hobby Circuit designed by David Johnson P.E.,
CW & CCW
Alternating Motor Driver - A while
back a company needed a motor controller for a custom door latching system. The system used a small brush motor
with a speed reduction gear to both latch and unlatch the door. When pulsed for about 250ms in the clockwise
direction, the motor would unlatch the door . . . [Hobby Circuit designed by Dave Johnson P.E., 09/05/10]
DC Motor-Driver H-Bridge Circuit - Physical motion of some form helps differentiate a robot from a computer.
It would be nice if a motor could be attached directly to a chip that controlled the movement. But, most chips
can't pass enough current or voltage to spin a motor. Also, motors tend to be electrically noisy (spikes) and can
slam power back. . . [David Cook]
DCC Booster Circuit #2 (LMD 18200) - The second schematic is for a 3 Amp - DCC Booster with automatic
shutdowns for DCC signal failure and high current loads. This circuit also uses the LMD 18200 CMOS, H-Bridge.
This page features H-Bridge circuits used for controlling direct current motors - scroll to find this one. . . .
[from Rob Paisley's Model Train web site]
DMOS 3A, 55V, H-Bridge - Application Note. . . [National Semiconductor]
Four-transistor H-bridge - an interesting 4-transistor H-bridge variant; this is cheap and easy to
build, and best of all is "smokeless" (i. e. , no combination of inputs can cause the bridge to self-destruct). .
. . [Wilf Rigter's web site]
Full-featured Dual H-bridge - I had always assumed that dynamic braking would be most effective at
higher speeds. However, actual tests using a Faulhaber (micro mo) gearmotor showed that the brake would hold a
motor almost stationary. These gearmotors are so well made that I can turn the 4 mm diameter shaft with light
finger pressure. For the tests I had mounted a 90 mm diameter wheel, which gave me tremendous mechanical
advantage. I found with the wheel mounted that I could barely turn the motor against the brake. . . . [Bruce
Full-featured H-bridge - This is a slightly revised version of the 6-transistor H-bridge designed
by Mark Tilden and found on the BEAM Tek website (now only available via archive). I encourage anyone interested
in H-bridges to read Mark's article, as it gives an excellent step-by-step explanation of how the bridge works.
In particular, it discusses variations on the bridge, such as the positive-input and negative-input versions. The
basic circuit is as Mark describes it. The changes are as follows. . . . [Bruce Robinson]