EEDTS Pro - Booster Amplifier r

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< Power Electronic ~ EEDTS Pro - Booster Amplifier r

eric

Posted: Thu Oct 12, 2006 10:24 pm Post subject: EEDTS Pro - Booster Amplifier r

Site Admin Joined: 01 Jan 1970 Posts: 311

As elsewhere, compatibility is an
important matter in model railway
systems. Because of this, it was
already stated earlier in this series of
articles that the Märklin booster
amplifier would be supported. For
this purpose, a special interface has
been designed that may be linked to
one of the 5-way connectors at the
back of the Märklin unit.
The back of the Märklin unit is
shown in Figure 1. The two 5-way
connectors are identical so that it does
not matter which of the two is used.
The controller of the EEDTS Pro system
has a signal output at TTL level
which is intended for the booster
amplifier. This signal, available at pin 3
of K8 (see Part 1 in our June 1999
issue), is linked directly to pin 1 of the
Märklin unit. In case of a short-circuit,
this signal need not be decoupled as is
the case with the EEDTS unit.
The GND connection of the controller
(pin 2 of K Cool

is continued to the
GND terminal (pin 4) of the booster
amplifier. This results in the interface
being powered when the controller is
switched on.
In normal operation, pin 5 is at low
TTL level, which is passed on to the
interface. When a short-circuit occurs,
this situation no longer prevails.
C I R C U I T D E S C R I P T I O N
The diagram in Figure 2 shows that
the interface is based on three Schmitt
trigger inverters. Connector K1 is
linked to K8 on the controller and connector
K2 to the Märklin booster amplifier
via a four-core cable.
When the power supply is
switched on, capacitor C1 is discharged.
This forces R-S bistable IC1b-
IC1c to assume a defined status: if the
output of IC1b is low, the output of
IC1c is high. After a while, C1 will
have been charged via R3, but diode
D2 ensures

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