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Motorcycle Alarm #4 - This is a simple easy to build transistor based motorcycle alarm. It's designed to work at
12-volts. But if you change the relay for one with a 6-volt coil it'll protect your "Classic Bike". The standby current is
virtually zero so it won't drain your battery. . . . [Andy Collison's website]
Motorcycle Alarms Numbers 5 & 6 - These are two easy to build relay-based alarms. You can use them to protect your motorcycle but
they have many more applications. If you use relays with 6-volt coils they'll protect your "Classic Bike". Both alarms are
very small. The completed boards occupy about half a cubic-inch 8 cc. The standby current is zero so they won't drain your
battery. Circuit designed by Ron J. . . . [Andy Collison's website]
Motorcycle Battery Charger - This 3A charger was originally designed to work with small batteries like those used in
motorcycles. In principle it can be used to charge car batteries also but will take a lot longer. The charger below charges a
battery with a constant current to 14. 1 volt. When this level is reached, the current charge drops automatically to a safer
level (13. 6V) and keeps charging. . . [Jan Hamer, The Netherlands]
Motorcycle Brake Light Flasher - Several years ago one car manufacturer added a rapid flasher to their brake lights. Wow! Those
things really got your attention when the driver stepped on the brakes. But, if you ever had to stop behind one at a traffic
light at night, you were likely to go into seizures from the strobing, rear lights covering your field of vision. I think
they dumped the idea. . . [Tony van Roon's schematic]
Motorcycle Low battery voltage warning
circuit - . . .
Motorcycle Low Voltage Warning - This circuit is connected to your motorcycle. It's tapped into a circuit thats only powered
with the key "ON". If you turn the bike off with the kill-switch and leave the key on, as you know, the headlight will stay
on and quickly drain the battery. . . . [Tony van Roon's schematic]
Motorcycle Turn-signal System - This circuit is based on the CMOS IC from Motorola, the MC14049UB Hex Inverting Buffer. Of
course, the regular CD4049 can be used and is pin-for-pin compatible. The 4049 is a 16-pin chip. Maximum DC supply voltage
should not exceed 18V. The above diagram can replace your existing mechanical clicker. The prototype worked excellently!. .
. [Tony van Roon's schematic]
Motorcycle Universal Gear
Indicator - This is a new design for a universal gear indicator that
can be fitted to any motorcycle as an aftermarket accessory. Its main advantage is that its operation depends entirely on the
gear shift lever movement, . . . Vassilis Papanikolaou
Motorcyle Alarm 2 - This circuit features an intermittent siren output and automatic reset. It can be operated
manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the
ignition. By adding external relays you can immobilize the bike, flash the lights etc. Ron has used my Asymmetric Timer as
the basis for his design. . . [Circuit designed by Ron J.]
MTX250 Car Amplifier:
Autoformer Switch-Mode Power Supply - This is a small 2*25 (actually,
2*50) WPC amplifier with 3-order crossover stage (configurable as LP or HP). Of particular interest is the unconventional
autoformer PS arrangement. Since the power FET's drains are not tied to ground anymore, it needs another transformer to drive
gates. . . [klausmobile @ yahoo.Com]
Multiplexe Automotive Sensors with this circuit - 01/20/00 EDN Design Idea Often, aµC limits the number of input-capture lines to accommodate
the various types of automotive sensors with pulsed outputs, such as vehicle- and engine-speed sensors. The circuit in Figure
1 uses discrete components to multip. . . [by Adil Ansari]
Multiplexes Automotive Sensors - 01/20/00
EDN Design Idea Often, aµC limits the number of input-capture lines to accommodate the various types of automotive sensors
with pulsed outputs, such as vehicle- and engine-speed sensors. The circuit in Figure 1 uses discrete components to multip. .
. [by Adil Ansari]
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