Home |
Search |
Today's Posts |
|
Electronic Schematics (alt.binaries.schematics.electronic) A place to show and share your electronics schematic drawings. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to alt.binaries.schematics.electronic
|
|||
|
|||
Sonic Defender project
Hello,
I wanted to resurrect an old project from Popular Electronics magazine May 1991. I thought some people on this list might want to build it. Its a very very loud alarm, to get someone's attention, but the frequencies that it operates at don't match the description in the magazine article, they're higher. The alarm is still very annoying though. Some of the parts are not available such as the matsu****a transducer ( piezo) if anyone knows were to get them please post. I use a piezo tweeter which is much larger but works very well. It's a three page article so here we go. Shaun |
#2
Posted to alt.binaries.schematics.electronic
|
|||
|
|||
Sonic Defender project
"Shaun" wrote in message ... Hello, I wanted to resurrect an old project from Popular Electronics magazine May 1991. I thought some people on this list might want to build it. Its a very very loud alarm, to get someone's attention, but the frequencies that it operates at don't match the description in the magazine article, they're higher. The alarm is still very annoying though. Some of the parts are not available such as the matsu****a transducer ( piezo) if anyone knows were to get them please post. I use a piezo tweeter which is much larger but works very well. It's a three page article so here we go. Shaun oops, the pages didn't go threw in the right order. also note that Niche Technologies cannot be found, so you can't order parts from them. Shaun |
#3
Posted to alt.binaries.schematics.electronic
|
|||
|
|||
Sonic Defender project
"Shaun" wrote in message
... oops, the pages didn't go threw in the right order. also note that Niche Technologies cannot be found, so you can't order parts from them. Shaun Nice scan quality. You must have used high quality (low compression) as there are very few artifacts about single points. I usually try scanning to a PDF file and can get multiple pages into one document. Single pages, especially with line art work well with a GIF format. |
#4
Posted to alt.binaries.schematics.electronic
|
|||
|
|||
Sonic Defender project
"Shaun" wrote in message ... Hello, I wanted to resurrect an old project from Popular Electronics magazine May 1991. I thought some people on this list might want to build it. Its a very very loud alarm, to get someone's attention, but the frequencies that it operates at don't match the description in the magazine article, they're higher. The alarm is still very annoying though. Some of the parts are not available such as the matsu****a transducer ( piezo) if anyone knows were to get them please post. I use a piezo tweeter which is much larger but works very well. It's a three page article so here we go. Shaun I figured out how to get the frequencies right. Change C3 and C4 to 0.022uF from 0.01uF That lowers the frequencies and make the alarm louder and at the right pitch. Problem solved. Shaun |
#5
Posted to alt.binaries.schematics.electronic
|
|||
|
|||
Sonic Defender project
"Shaun" wrote in message ... "Shaun" wrote in message ... Hello, I wanted to resurrect an old project from Popular Electronics magazine May 1991. I thought some people on this list might want to build it. Its a very very loud alarm, to get someone's attention, but the frequencies that it operates at don't match the description in the magazine article, they're higher. The alarm is still very annoying though. Some of the parts are not available such as the matsu****a transducer ( piezo) if anyone knows were to get them please post. I use a piezo tweeter which is much larger but works very well. It's a three page article so here we go. Shaun I figured out how to get the frequencies right. Change C3 and C4 to 0.022uF from 0.01uF That lowers the frequencies and make the alarm louder and at the right pitch. Problem solved. Shaun Other changes for more power and louder: Change the 10 ohm resistor (R7) at the emitter of Q1 to a 3.3 ohms at 1 watt. Change R6 to 180 ohms. Change R5 to 470 ohms. And for the piezo buzzer, use a piezo tweeter, you can get them off of ebay. Shaun |
#6
Posted to alt.binaries.schematics.electronic
|
|||
|
|||
Sonic Defender project
"Shaun" wrote in message ... "Shaun" wrote in message ... Hello, I wanted to resurrect an old project from Popular Electronics magazine May 1991. I thought some people on this list might want to build it. Its a very very loud alarm, to get someone's attention, but the frequencies that it operates at don't match the description in the magazine article, they're higher. The alarm is still very annoying though. Some of the parts are not available such as the matsu****a transducer ( piezo) if anyone knows were to get them please post. I use a piezo tweeter which is much larger but works very well. It's a three page article so here we go. Shaun I figured out how to get the frequencies right. Change C3 and C4 to 0.022uF from 0.01uF That lowers the frequencies and make the alarm louder and at the right pitch. Problem solved. Shaun Correction: Change C4 to 0.022uF and leave C3 at 0.01uF Shaun |
#7
Posted to alt.binaries.schematics.electronic
|
|||
|
|||
Sonic Defender project
On Sun, 06 Dec 2009 19:06:17 -0600, Shaun wrote:
Other changes for more power and louder: Change the 10 ohm resistor (R7) at the emitter of Q1 to a 3.3 ohms at 1 watt. Change R6 to 180 ohms. Change R5 to 470 ohms. And for the piezo buzzer, use a piezo tweeter, you can get them off of ebay. Or just spring for a Sonalert and be done with it. ;-) Cheers! Rich |
#8
Posted to alt.binaries.schematics.electronic
|
|||
|
|||
Sonic Defender project
On Sun, 06 Dec 2009 19:06:17 -0600, Shaun wrote:
Other changes for more power and louder: Change the 10 ohm resistor (R7) at the emitter of Q1 to a 3.3 ohms at 1 watt. Change R6 to 180 ohms. Change R5 to 470 ohms. And for the piezo buzzer, use a piezo tweeter, you can get them off of ebay. Or just spring for a Sonalert and be done with it. ;-) Cheers! Rich |
#9
Posted to alt.binaries.schematics.electronic
|
|||
|
|||
Sonic Defender project
On Sun, 06 Dec 2009 19:06:17 -0600, Shaun wrote:
Other changes for more power and louder: Change the 10 ohm resistor (R7) at the emitter of Q1 to a 3.3 ohms at 1 watt. Change R6 to 180 ohms. Change R5 to 470 ohms. And for the piezo buzzer, use a piezo tweeter, you can get them off of ebay. Or just spring for a Sonalert and be done with it. ;-) Cheers! Rich |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Warwick Sonic III amp | Electronics Repair | |||
Worx Sonic Crafter | UK diy | |||
How to change the batteries in an Defender 3000 alarm system? | UK diy | |||
Black Ice Defender | UK diy |