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cooled 4-cylinder; a year before they
went to fuel injection and sensors. The
coils are Pertronix flame-thrower (2 x
45kV, epoxy core, 0.6Ω.)
There are several points in its original vacuum advance system that could
be used for the Sensym sensor. One is
from the fuel manifold but I assume
contamination would not be good for
the sensor.
• The open-circuit output voltage
siliconchip.com.au
from the Programmable Ignition
System is 0-5V. It may be difficult to
arrange a system whereby the unit’s
output was directed to power separate
coils, depending on the distributor
position. Each coil driver would need
to be connected immediately after the
firing of the previous coil in order to
maximise the dwell period.
The Programmable Ignition System
does not have facility to provide a
dwell period that is greater than the
period between each trigger. In addition, this period is reduced by the
firing period minimum of 1ms. You
will not gain any advantage from
using separate coils unless you have
each coil driver start to charge its
coil immediately after its own firing.
This extra dwell will cause heating in
the coil once it is charged. A ballast
continued page 104
August 2014 103
Preamplifier For A Yamaha Electric Piano
I own a Yamaha piano (as distinct
from a keyboard). The piano doesn’t
have enough output amplitude from
‘Aux Out’ to drive an amplifier,
hence the need for a stereo preamp
such as that described in April 1994.
In the kit, three alternatives are
offered namely: magnetic cartridge,
tape/cassette deck and microphone.
I’m assuming that the RIAA curve
would not be relevant and neither
would the microphone option. I
am intending to wire in the tape or
cassette option.
Am I correct or can you suggest another option for low output
pianos? (D. V., via email).
resistor may be required to limit the
maximum current in each coil.
The Sensym ASDX015A24R is hard
to get. We recommend that you use an
automotive MAP sensor. You can obtain new MAP sensors from: www.cyberspaceautoparts.com.au/contents/
en-uk/d3721_Holden_Map_Sensors.
html or from similar suppliers.
A secondhand MAP sensor can be
obtained from a wreckers yard. We
used a standard V6 MAP sensor in
our prototype.
500W speed control for
a 240V DC brush motor
I have a 230-240V DC 500W brush
motor that has been removed from a
treadmill and I need to be able to vary
its speed. Would the new 230VAC
Speed Controller For Universal Motors
(SILICON CHIP, February & March 2014)
work on this motor? (A. C., via email).
• Yes, this motor speed controller
works with 240V DC motors. However,
we suspect that your treadmill motor
may be a standard universal AC motor.
This is a series-wound brush/commutator motor which will run equally
well on AC or DC.
Extra slaves for
Micromite
Can you have more than one slave
connected to a Master Micromite via
the I2C connection, as in Fig.8 on page
73 of the June 2014 issue. If so, how?
Also, have you considered modifying the 30A DC Relay project (No104 Silicon Chip
•
None of the suggested options in
the article would be suitable. The
RIAA and Tape options have frequency tailoring and high gain while
the microphone option has too much
gain. Your Auxiliary output should
have 100mV or more and typically
250mV, so a gain of four would probably be the maximum you need.
We suggest the same arrangement
as the microphone option with R4
at 390Ω and R1 a wire link. The R2
value would only need to be 1kΩ
for a gain of 3.56. If you need more
gain, use a 2.2kΩ or 4.7kΩ resistor;
for less gain, use an 820Ω resistor.
Capacitor C2 can be 1nF.
vember 2006) to have four or eight
DPDT relays on one circuit board? The
outputs could use header pins and/or
screw terminals. A relay rating of 1A
would be OK. I think this would be a
useful to connect to a Micromite. (J.
S., via email).
• Yes, you can attach multiple slaves
to the one master. The only limitation
is the number of I2C addresses that are
available (112 devices).
We do not have plans to modify the
November 2006 project but yours is
a good idea for the future. The board
could also have inputs as well as relay
outputs and could be controlled over
I2C. We will have a look at it to see if
it’s feasible.
Ultrasonic cleaner may
be wired incorrectly
I have purchased and assembled
your Ultrasonic Cleaner (SILICON CHIP,
August 2010) and have a few issues
you might be able to help me with.
After assembly, I did the first electrical check as per your instructions,
removing fuse F1 and IC1 from circuit.
The regulator voltage was within parameters of 4.85V and 5.15V DC. The
power light comes on but the unit
won’t activate when set to timer or start
and the run LED won’t light.
I have included some photos to
assist. Your thoughts on solving this
problem would be appreciated. (B. F.,
via email).
• From the photos you supplied it
seems that only two wires are connected on the PCB for the timer po-
Advertising Index
Altronics.................................. 72-75
Aust. Exhibitions & Events............ 47
Consulting & Eng. Services........ 103
Control Devices Pty Ltd.................. 5
Emona Instruments........................ 7
Harbuch Electronics....................... 6
Hare & Forbes.......................... OBC
High Profile Communications..... 103
Icom Australia.............................. 31
Jaycar .............................. IFC,49-56
Keith Rippon .............................. 103
Kinsten Pty Lyd.......................... 103
KitStop............................................ 8
LD Electronics............................ 103
LEDsales.................................... 103
Master Instruments........................ 9
Microchip Technology................... 27
Mikroelektronika......................... IBC
Ocean Controls............................ 11
QualiEco Circuits Pty Ltd............. 59
Quest Electronics....................... 103
Radio & Hobbies DVD.................... 8
RFrepairs................................... 103
Rohde & Schwarz.......................... 3
Sesame Electronics................... 103
Silicon Chip Binders....................... 6
Silicon Chip Online Shop........... 101
Silicon Chip Subscriptions........... 91
Silvertone Electronics.................. 10
Tronixlabs Pty Ltd....................... 103
Wiltronics...................................... 13
Worldwide Elect. Components... 103
tentiometer. Depending on how this
is wired to the potentiometer it will
have an effect on the timer operation.
It may be that the timer duration is so
short that it finishes almost immediately after the Start button is pressed.
Check that pin 4 of IC1 is at 5V
normally and then is at 0V while the
Start switch is pressed. Check also that
all the IC pins are correctly inserted
into the IC socket and not bent under
SC
the socket.
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