Old AC-Powered Fire Alarm Horns!
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- Опубликовано: 13 июл 2024
- It's time to take a look at some more electromechanical fire alarm horns, from the era where many systems operated on 120 VAC instead of 24 VDC.
Featured in this video are the Edwards model 374 Adaptahorn, the deafeningly loud Faraday Type 512, and the rare and unusual Faraday 7410 reed buzzer.
Also shown are two Cerberus Pyrotronics model HAC-120 "Pyr-A-Larm" horns. These are relabeled Federal Signal Vibratone 350 DR horns. These horns differ from the normal 350 (aka the Simplex 4040) in the presence of a polarizing diode. I don't know what purpose this served, so feel free to leave a comment!
Table of Contents:
0:00 - Introduction
0:21 - Edwards 374 Adaptahorn overview
0:36 - Edwards 374 Adaptahorn - test
0:49 - Faraday Type 512 overview
1:05 - Faraday Type 512 test
1:15 - Faraday 7410 overview
1:30 - Faraday 7410 test
1:41 - Pyrotronics HAC-120 overview
1:58 - Pyrotronics HAC-120 test (Series A1)
2:04 - Pyrotronics HAC-120 test (Series B1)
2:15 - Science Lesson!
3:07 - Conclusion 
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The first one was the best and the school. I attend had those type of buzzers and they were the best and affectedly.
What I would do is modify/hack a modern electric fire notification appliance, and replace the sound with that of the Edwards adaptahorn so that the sound can be preserved. Same with the Firecom 2500 whoop/chime.
In 2016, my dad and I didn’t know better, so we hooked up my 2901-9806 to 120v AC (PlayStation 2 Power Cable Chopped Up) and it became an HAC-120. It started smoking and sparking when I tried to test it later on and kinda show my friends. Fun day!
I have a simplex 4050 and when i try to hook it up to a 9volt battery it barly works, do i need 3 of the 9 volt betterys or is it the 4050 itself?
And also for some reason when i sniff the back of my 4050 it smells like a old pencil sharpener, it was probly originaly in a school or collage
@@BoredRock112the 4050 is an AC horn. Please refer to the label, it’ll tell you the voltage.
@@BoredRock112the 4050 is an AC horn
@@Loganetics1who are you
There is a Edwards Adaptahorn 374 that I found at a school my mom works at
2:00 looks just like a simplex 4040
Old school near me has like 5 of those old Edwards horns. Really cool
Those new grille 350s are used in a lot of instances now: Scoreboards, Carwashes, emergancy alarms. There's even one in our motorpool on the overhang, but I never stand to close to it in case someone decides to make a dumb joke and set it off
Have 3 versions of that faraday horn, the “flush” mount (the one seen in the video), the standard horn, and a trumpet style horn.
The school I am going to next year has the faraday 7410 horns, and a mixture of many other alarms,
That's interesting. You sure they're not 5410's or 4050's?
@@Fahrenheit4051 I’m pretty sure they are the 7410s, there was actually one at another place I been to before, however I don’t remember what the place is called
Very informative
Most of my high school used the edwards 374, if I'm not wrong
AC horns with polarizing diodes vibrate 60 times per second, half of the vibration frequency of non-polarized AC horns, and thus can generate a deep, penetrating sound with more bass.
I've seen a white Faraday type 512 at my high school.
Used as a scoreboard buzzer.
I've heard it before. And it's not raspy.
You probably saw a Federal 30A. It looks very similar, but doesn't sound raspy. It's a common scoreboard horn, and my high school's scoreboard had one too.
@@Fahrenheit4051 It wasn't a federal signal 30A i saw the model number of it.
@@Davesand2003 Ok
The Faraday 7410 and Pyrotronics HAC-120 Series A1 are both used as outdoor bells at school, they are quite old so they often malfunction.
0:40 I had this fire alarm in my elementary school until I moved schools unfortunately :(
I miss it dearly ngl. I'm going to find one off of Ebay, Plus the pull station that went with it because I'm obsessed with old mechanical horns.
Edit: Just bought one. On it's way.
I recently got a horn that’s ac and diode polarized like the Pyrotronics HAC-120s you have.
My high school had Pyratronics HACs with space age AV32s and MFS pull stations
You sure they're the AC version? That would be really unique. So they don't sound like air horns?
@@Fahrenheit4051 from what I remember
The first alarm is my school bell
What's your school's fire alarm?
Edwards est
We've got an Edwards 374 in the hallway outside my office at work, but it's not hooked up. Kind of bums me out, I'd love to hear it one good time.
There's one outside a church building in West Hartford. Probably still works, but may be general or time signaling.
nice. i would like to do a system test with ac horns. i would need to find a tranformer that inputs dc volts and outputs ac volts
That's called an inverter, but you shouldn't need one. What you would need is a transformer that goes directly from 120 to whatever voltage your AC horn runs on. No need to convert to DC first.
If you're trying to control them with your 4004, I believe there's a way to use the auxiliary alarm relays. Try asking one of the techs.
What does the diode on the 350 do? So is it a AC Horn with a positve or negative? Im confused lol
I'm not entirely sure. It may be that there were systems with a DC supervision current but an AC alarm current. I have seen AC systems that had backup batteries just for the trouble lamps.
@@Fahrenheit4051 or is it just a regular AC with no positive and negative but ita the diode that makes it sound at 120hz instead of 60
@@TheTrainsandfirealarmdude It's a 120 VAC horn. But again, polarizing it allows a DC current to travel through the wires without passing through the horns. Do you know how a NAC works?
Also, the diode makes it "clap" at once per cycle (60 Hz), instead of once per half-cycle (120 Hz). This will make it sound an octave lower.
@@Fahrenheit4051 idk about nacs i dont have a panel or know lot about them
Very cool! I wonder what purpose those diodes serve on the HAC/350 horns
I have seen some AC horns before but all of the horns I find are disconnected.
I've seen AC horns in several locations. One was at the Plainville town hall, which had 4040's. Photos of that system are available on my Instagram page. Several buildings at UHart also have 4040's, some of which are probably disconnected.
Most of the other places I've seen them were in New Britain, CT. My second elementary school had disconnected Adaptahorns with the "FIRE HORN" badge. The actual signals were 4903+9838's in continuous. One staff member thought all the noise came from the old horns, and I think I corrected her.
Another example was at the defunct Holy Cross/Pope John Paul II school. They hosted a summer carnival every year, and I was able to see a 4040 in the window. One time I heard them going off in continuous while driving by.
The last example I can recall was in an old building (can't remember the name) that had dual-projector 4030's as their main alarms. It was over a decade ago so good chance this system no longer exists.
Federal signal 350 sounds broken.
Or it could be half wave version