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This is only a preview of the February 2003 issue of Silicon Chip. You can view 27 of the 96 pages in the full issue, including the advertisments. For full access, purchase the issue for $10.00 or subscribe for access to the latest issues. Articles in this series:
Items relevant to "The PortaPAL Public Address System":
Items relevant to "The SC480 50W RMS Amplifier Module; Pt.2":
Items relevant to "Using Linux To Share An Optus Cable Modem; Pt.4":
Items relevant to "A Windows-Based EPROM Programmer; Pt.3":
Purchase a printed copy of this issue for $10.00. |
Notes & Errata
so that the correct connections are
made.
5A Universal Motor Controller,
October 2002: Fig.4, the overlay diagram on page 17, shows the device
installed for SCR1 as an MCR100.
If you fit a C103B, remember to reverse the device so that the flat on
the package faces down; ie, towards
the edge of the PC board.
Capacitor Leakage Adaptor for
DMMs, December 2002: the maximum supply voltage to this circuit
should be limited to 30V DC.
Fig.1: this circuit shows how to hook a smart card to a PIC programmer.
Reader/Programmer for Smart
Cards, January 2003: this project
can only be used to read and program the EEPROM in a card where
the PIC microprocessor has already
been programmed. Howev
er, the
PIC in a blank card can be programmed quite easily using a standard PC-driven PIC programmer,
such as the one published in the
March 2001 issue of SILICON CHIP.
All that is needed for this is to make
up an adaptor so that the card can
be connected to the programmer’s
18-pin PIC socket.
To make up an adaptor, mount a
card socket identical to the one used
in the January 2003 programmer
each colour turn on for say 30-45
seconds (by itself), switch off and at
the same time the next colour turn
on – sort of a sequencer situation but
with each colour staying on for at least
30 seconds.
Are you able to suggest a way to
modify the kit for longer ‘on’ times?
(K. J., via email).
• We assume you are referring to our
design published in the March 1994 issue. It is quite simple to slow it down.
Just change the 2.2µF capacitor to
47µF tantalum and change the 100kΩ
trimpot to a 680kΩ resistor.
Interfacing the stepper
motor controller
I have read and thoroughly enjoyed
92 Silicon Chip
(ICA-7000, Jaycar Cat No. PS-0012)
on a small piece of matrix board,
so you can make connections to its
card contact pins. Then using the
above diagram (Fig.1) as a guide,
connect the pins to an 18-pin DIL
plug using a short length of rainbow
ribbon cable. The DIL plug can then
be plugged into your PIC programmer’s ZIF socket.
Note that if you can’t obtain an
18-pin DIL plug, you can use a
16-pin wirewrap DIL socket and
change the pin connections as
shown. Then the ‘tails’ of the socket
can be plugged into the programmer’s ZIF socket. Just make sure
you plug it in at the pin1/18 end,
the articles on the Stepper Motor
Controller (May 2002) and the Rolling
Code 4-Channel UHF Remote Control
(July 2002). My interest is in regards to
interfacing these two projects so that I
can use the UHF remote to control the
direction of a stepper motor.
The project is intended to revolve
a car amplifier from the roof (laying
horizontal) down 90° to a vertical position and reverse, using one channel
each of the UHF remote output relays
to switch the driving stepper motor
forward and reverse (that’s the plan).
Obviously, this would only be done
when the car was parked and the intention is to use these circuits from
your magazine for car shows. The
other two channels on the UHF remote
control system are to be connected to
Gear Indicator, January 2003: the
parts list should include 2 x 4.7kΩ
resistors. Also the 400mm of 0.8mm
tinned copper wire can be 100mm
in length. The 2.2kΩ resistor shown
on the overlay diagram to the right
of VR1 should be 4.7kΩ.
Midi-Mate Interface for PCs, February 2001: it has been found that
the MIDI-in port does not work with
all PC sound cards. The simplest
solution is to increase the value
of the resistor in series with LED1
to 680Ω (from 330Ω) and then fit a
470Ω resistor on the underside of
the PC board so that it is in parallel
with the series combination of LED1
and the 680Ω resistor; ie, from the
+5V rail directly to pin 13 of IC1.
12V solenoids mounted in a frame so
as to lock the subwoofer boxes into
the car boot area and prevent them
from being stolen. One channel would
fire two solenoids into the locking
position and the 4th channel would
unlock them.
So, my question is what do I need
to do to interface these two projects
in order to be able to remotely control
the stepper motor direction? (R. W.,
via email).
• The relays of the UHF remote will
do the job directly. Use them to control
direction.
Connect the DIR input to +5V via a
10kΩ resistor and then pull this input
low via a relay to change direction. Use
the other relay to link the OSC and
SC
Step terminals for stepping.
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