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Chirps for a Ford AU Falcon In answer to MD’s question regarding the Ford AU audible car lock (July 2003), here is an extract from the “Security Pamphlet” (Rev 1 of 2/00) issued when these vehicles were new. It is assumed the vehicle has the integrated alarm. “Arm/disarm” chirps can be turned on or off using the fol­lowing procedure: (a) Turn the siren key to the “Test” position. The siren will emit two chirps; (b) Turn the ignition key to the “ON” position and watch the indicators; (c) On the seventh flash of the indicators, turn fuseholder on the PC board and use an in-line fuseholder with a 20A fuse. This will need to be a 5AG or blade fuse type (available from Jaycar). Compensating for industrial deafness Along with many others, I suffer from industrial deafness; not too bad but enough to be a nuisance to me and my family. The usual characteristic is a loss of hearing at 2kHz and 4kHz the so-called “2k and 4k notch”. The 2kHz notch is unfortunately right in the range of sounds that characterise so much speech and so make it difficult to pick out words. What is required is an amplifier which can be attached to the TV set speaker wires to correct for these frequencies and then feed it to the speakers. I am told by an audiologist that it is unlikely that other listeners would notice it much and it would mean that we can run the TV at lower volume. Another option would be an ap- the ignition “OFF” (the siren will emit seven confirmation chirps); (d) Turning the ignition ON-OFF will toggle the selection – one chirp indicates chirps have been se­lected “OFF”, two chirps indicate chirps have been selected “ON”; (e) Return the siren key to the “ON” position to lock in the selection. I have an AUII Fairmont and just after I bought it brand new I had a warranty problem with the alarm system that caused me to seek advice from the alarm manufacturer “Vision Automotive Technology”. They were more than happy to help me out with my problem. (P. J., Dubbo, NSW). propriate amplifier to feed signals to an FM transmitting headphone set. I have a set of these and they save the volume problem for everyone else but are a nuisance. (R. C., Parkdale, Vic). • Your audiologist is wrong. Boosting the midrange sufficient­ly for you to hear it will make the sound quite unpleasant for others. Your FM headset is the better solution. Li’l Pulser Train Controller. I have just completed the Li’l Pulser Train Controller and find that the output drive starts at about half scale. When the speed control is set down low, there are “bursts” of output. What could be the problem? (B. S., Conder, ACT). • The controller requires a motor to be used as a load so that the speed can be controlled. If you are using a different load, it will cause problems. Check the orientation of diodes D4 & D5 and the components around IC1a and IC1b. Make sure that the trimmer potentiometers are installed in their correct place and that the 12V is going to IC1 and IC2. Using the Mixture Meter with old engines I have built the Fuel Mixture Meter from the September 2000 issue but I was going to use it on an older pre-unleaded engine (1972 vintage car). I realise that the EGO sensor would be ad­ versely effected by the tetraethyl lead additives that were used but what about the newer fuels; ie, the super lead-substitute fuels that do not necessarily use lead additives? Can these newer fuels, that are specifically designed for pre-unleaded vehicle engines, be used longer term with the zirco­nia sensors or is it only short term as described? (R. Z., via email). • Just use LRP (lead replacement petrol) and it will work fine. Preamp for neon tube modulator I was wondering how I could incorporate a microphone input into the Neon Tube Sound Display project (SILICON CHIP, November 2001)? Would I need to add an amplifier, preamp or anything like that? The type of microphone would probably be a standard elec­tret microphone. (A. H., via email). • Have a look at the PreChamp project, described in the July 1994 issue. Notes & Errata PC Infrared Remote Receiver, August 2003: the parts list the PC board size as 100.5mm x 117mm. It should be 47mm x 59mm. WARNING! SILICON CHIP magazine regularly describes projects which employ a mains power supply or produce high voltage. All such projects should be considered dangerous or even lethal if not used safely. Readers are warned that high voltage wiring should be carried out according to the instructions in the articles. When working on these projects use extreme care to ensure that you do not accidentally come into contact with mains AC voltages or high voltage DC. If you are not confident about working with projects employing mains voltages or other high voltages, you are advised not to attempt work on them. Silicon Chip Publications Pty Ltd disclaims any liability for damages should anyone be killed or injured while working on a project or circuit described in any issue of SILICON CHIP magazine. Devices or circuits described in SILICON CHIP may be covered by patents. SILICON CHIP disclaims any liability for the infringement of such patents by the manufacturing or selling of any such equipment. SILICON CHIP also disclaims any liability for projects which are used in such a way as to infringe relevant government regulations and by-laws. Advertisers are warned that they are responsible for the content of all advertisements and that they must conform to the Trade Practices Act 1974 or as subsequently amended and to any governmental regulations which are applicable. 92  Silicon Chip www.siliconchip.com.au