Electrohome ECP 4100 Series Manual de usuario descargar pdf (Pagina 2)

This circuit has been succesfully used with Electrohome Projection Systems ECP 4100 video projector in many

VGA and SuperVGA modes. The circuit have been also used succesfully with one old Barco video projector using

my VGA to TV drivers to get the VGA card to generate suitable signal frequencies which that old video projector

can handle.

Component list

C1 22 uF 10V electrolytic

C2 22 uF 10V electrolytic

R1 2.2 kohm

R2 2.2 kohm

R3 1.8 kohm

R4 1.8 kohm

R5 2.7 kohm

R6..R8 47 ohm

U1 74LS86 or 74HCT86

T1 BC 547

T2 BC 547

TTL level sync signal

Many computer monitors have been designed to accept TTL level sync signals. If you happen to own a monitor

which uses TTL level sync signals the circuit above does work with with it, because the sync signal level from that

circuit is not enough for the monitor. I have designed another simpler circuit for monitors which need TTL levels.

Note: The circuit diagram does not show the wire giving power to IC1. The +5V power is connected to pin 14 and

ground is connected to pin 7.

This circuit is basically the same as the first circuit. The only only difference is that the transistor driver stage have

been left out from the circuit, because not so much driving capacity is needed and TTL levels signals from the IC

are what is wanted. Because the 74LS86 IC directly drives the output without any further buffering, it is only

suitable for driving high impedance (1 kohm or more) sync inputs.

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Electrohome ECP 4100 Series Manual de usuario Pagina 2