Showing posts with label Make. Show all posts
Showing posts with label Make. Show all posts
Thursday, October 16, 2014
Make Relay Based Motorcycle Alarm Circuit Diagrams
You can Make Relay Based Motorcycle Alarm Circuit Diagrams. You can use them to protect your motorcycle - but they have many more applications. If you use relays with 6-volt coils - theyll 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 wont drain your battery.
Relay Based Motorcycle Alarm Circuit Diagram 1 uses a SPCO/SPDT relay - but you really only need to use a SPST relay. If you are going to use the veroboard layout provided - youll need to use the style of relay specified. But you can build the alarm using whatever style of relay you have available.
Relay Based Motorcycle Alarm Circuit Diagram 1
Any number of normally-open switches may be used. Fit the mercury switches so that they close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc. When one of the trigger-switches is closed - the relay will energize and the siren will sound.
You can choose what happens next. If you build the circuit as shown, the siren will continue to sound until you turn it off - or until the battery is exhausted. But, if you leave out D3 - the siren will stop sounding immediately the trigger-switch is re-opened.
While youre within earshot of your machine - the former configuration is best. You can always turn off the alarm yourself. But if you are going to be away from your bike for any length of time - and you dont want to cause a nuisance - then the latter configuration is probably more suitable. If you include a SPST switch in series with D3 - you can select the behaviour that best suits the circumstances at any given time.
Relay Based Motorcycle Alarm Circuit Diagram 1a
Relay coils and some sounders produce high reverse-voltage spikes that will destroy sensitive electronic components. D1 and D2 are there to short-circuit these spikes before they can do any damage. Although there is nothing in the alarm circuit itself that could be damaged - I have no idea what other electronic equipment might be connected to the same power supply. So I included the two diodes as a precaution. If youre satisfied that theres nothing on your bike that might be damaged in this way - you can leave out the two diodes.
Relay Based Motorcycle Alarm Circuit Diagram 2 uses a DPCO/DPDT relay - but you really only need to use a DPST relay. If you are going to use the veroboard layout provided - youll need to use the style of relay specified. But you can build the alarm using whatever style of relay you have available.
Relay Based Motorcycle Alarm Circuit Diagram 2
Any number of normally-open switches may be used. Fit the mercury switches so that they close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc. When one of the trigger-switches is closed - the relay will energize and the siren will sound.
You can choose what happens next. If you build the circuit as shown, the siren will continue to sound until you turn it off - or until the battery is exhausted. But, if you leave out the (yellow) solder-bridge in the top left-hand corner of the diagram - the siren will stop sounding immediately the trigger-switch is re-opened.
While youre within earshot of your machine - the former configuration is best. You can always turn off the alarm yourself. But if you are going to be away from your bike for any length of time - and you dont want to cause a nuisance - then the latter configuration is probably more suitable. Connect a SPST switch in place of the (yellow) solder-bridge - and you can select the behaviour that best suits the circumstances at any given time.
Relay Based Motorcycle Alarm Circuit Diagram 2 a
Relay coils and some sounders produce high reverse-voltage spikes that will destroy sensitive electronic components. D1 and D2 are there to short-circuit these spikes before they can do any damage. Although there is nothing in the alarm circuit itself that could be damaged - I have no idea what other electronic equipment might be connected to the same power supply. So I included the two diodes as a precaution. If youre satisfied that theres nothing on your bike that might be damaged in this way - you can leave out the two diodes.
Whichever alarm you build - the circuit board and switches must be protected from the elements. Dampness or condensation will cause damage. Without the terminal blocks - the board is small. Ideally, you should try to find a siren with enough spare space inside to accommodate it. Fit a 1-amp in-line fuse as close as possible to the power source. This is Very Important. The fuse is there to protect the wiring - not the circuit board. Instead of using a key-switch you can use a hidden switch; or you could use the normally-closed contacts of a small relay. Wire the relay coil so that its energized while the ignition is on. Then every time you turn the ignition off - the alarm will set itself.
When the alarms are not sounding - the circuits use no current. This should make them useful in other circumstances - where a power supply is not readily available. Powered by dry batteries - with the relay and siren voltages chosen to suit - the alarms could be fitted almost anywhere.
Sourced By : Streampowers
Thursday, October 2, 2014
How to Make a Simple FM Radio Circuit
This straightforward fm radio receiver circuit involves a regenerative rf stage, TR1, accompanied by a 2 of three-stage sound amplifier, TR2 to TR4.
In certain spots 3 steps of music boosting most likely are not needed, wherein situation TR3 and its related parts could be excluded as well as the free end of capacitor C5 linked to the collector of TR2.
The crucial portion of the fm radio receiver is the initial stage, TR1/VC1, in which the wirings needs to be kept as tight as they can. Coil L1 is established by winding 8 turns of 1mm (20 swg) enamelled copper wire on a six mm diameter former, that may be in that case eliminated. Following that L1 must be extended cautiously and uniformly to a length of about 13mm.
Transistors List
TR1 = BF199
TR2 = TR3 = TR4 = BC547
The tunning capacitor VC1 is among the 2 fm areas of a tiny fm transistor radio with integrated trimmers (VC2). The “earthy” tail (moving vanes and spindle) is hooked up to the 22pF capacitor C1. The value of the rf choke L2 is not important, whatever from 1µH to 10µH genuinely acceptable.
The output is appropriate for regular headphones linked in series to offer an impedance of 64Ω.
Tuning-in the fm radio receiver
To the radio receiver, potentiometer VR1 should initially be promoted gradually (in the direction of the end of the path linked to battery positive) until, at around the half-way position, an abrupt little rise in background disturbances is going to be heard, suggesting the beginning of oscillation. It after that must be assisted off, extremely steadily, until oscillation simply ceases; it next has to be easy to tweak in a few stations.
The right frequency range of 87 MHz to 108 MHz can be acquired by fine-tuning VC2 at the higher frequency (108 MHz) and somewhat flexing or squeezing jointly the turns of coil L1 towards the end (87 MHz).
About Frequency Modulation
FM transmitting is a transmission know-how pioneered by Edwin Howard Armstrong which employs frequency modulation (FM) to high-fidelity audio over broadcast radio. The "FM band" is the "frequency spectrum wherein FM is utilized for broadcasting". This phrase is moderately inaccurate, because it relates a modulation approach with a variety of frequencies.
In certain spots 3 steps of music boosting most likely are not needed, wherein situation TR3 and its related parts could be excluded as well as the free end of capacitor C5 linked to the collector of TR2.
The crucial portion of the fm radio receiver is the initial stage, TR1/VC1, in which the wirings needs to be kept as tight as they can. Coil L1 is established by winding 8 turns of 1mm (20 swg) enamelled copper wire on a six mm diameter former, that may be in that case eliminated. Following that L1 must be extended cautiously and uniformly to a length of about 13mm.
Transistors List
TR1 = BF199
TR2 = TR3 = TR4 = BC547
The tunning capacitor VC1 is among the 2 fm areas of a tiny fm transistor radio with integrated trimmers (VC2). The “earthy” tail (moving vanes and spindle) is hooked up to the 22pF capacitor C1. The value of the rf choke L2 is not important, whatever from 1µH to 10µH genuinely acceptable.
The output is appropriate for regular headphones linked in series to offer an impedance of 64Ω.
Tuning-in the fm radio receiver
To the radio receiver, potentiometer VR1 should initially be promoted gradually (in the direction of the end of the path linked to battery positive) until, at around the half-way position, an abrupt little rise in background disturbances is going to be heard, suggesting the beginning of oscillation. It after that must be assisted off, extremely steadily, until oscillation simply ceases; it next has to be easy to tweak in a few stations.
The right frequency range of 87 MHz to 108 MHz can be acquired by fine-tuning VC2 at the higher frequency (108 MHz) and somewhat flexing or squeezing jointly the turns of coil L1 towards the end (87 MHz).
FM transmitting is a transmission know-how pioneered by Edwin Howard Armstrong which employs frequency modulation (FM) to high-fidelity audio over broadcast radio. The "FM band" is the "frequency spectrum wherein FM is utilized for broadcasting". This phrase is moderately inaccurate, because it relates a modulation approach with a variety of frequencies.
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