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#1
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Vibrator power supply
I came by what appears to be a power supply module from some old
military gear. It uses a synchronous vibrator unless my analysis of the circuit it way off. My plan is to build a circuit to replace the vibrator with a couple of power FETs driven by a 555 osc and a bridge rectfier to handle rectification of the output. I was wondering if there were any circuit designs around before I started to reinvent the wheel. Also what freqency do they use. Seems like I heard 100Hz at one time but I dont trust my memory on something I learned 40 years ago. Any help would be much appreciate. Jimmie |
#2
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Vibrator power supply
On Fri, 4 Nov 2011, JIMMIE wrote:
I came by what appears to be a power supply module from some old military gear. It uses a synchronous vibrator unless my analysis of the circuit it way off. My plan is to build a circuit to replace the vibrator with a couple of power FETs driven by a 555 osc and a bridge rectfier to handle rectification of the output. I was wondering if there were any circuit designs around before I started to reinvent the wheel. Also what freqency do they use. Seems like I heard 100Hz at one time but I dont trust my memory on something I learned 40 years ago. Any help would be much appreciate. The earliest replacements would have been a couple of power transistors on a heatsink, with a few resistors and capacitors, relying on the existing transformer for feedback (and frequency control). Of course a lot of early power inverters were about the same, save that they weren't built around a vibrator supply. Look in forty year old ARRL Handbooks, I'm certain the 1971 edition (the first I ever saw) has a simple inverter that is on that level. I'm sure some built fancier ones, but I'm sure many got by with something pretty simple. SOme small companies that deal in antique radios sell virbrator replacements. Michael VE2BVW |
#3
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Vibrator power supply
Non-sychronous solid state replacements are avaialble here-
http://www.tubesandmore.com/ in the "Radio parts & restoration" section, p/n P-V2015N H. On Fri, 4 Nov 2011 08:17:05 -0700 (PDT), JIMMIE wrote: I came by what appears to be a power supply module from some old military gear. It uses a synchronous vibrator unless my analysis of the circuit it way off. My plan is to build a circuit to replace the vibrator with a couple of power FETs driven by a 555 osc and a bridge rectfier to handle rectification of the output. I was wondering if there were any circuit designs around before I started to reinvent the wheel. Also what freqency do they use. Seems like I heard 100Hz at one time but I dont trust my memory on something I learned 40 years ago. Any help would be much appreciate. Jimmie |
#4
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Vibrator power supply
Michael Black wrote:
On Fri, 4 Nov 2011, JIMMIE wrote: I came by what appears to be a power supply module from some old military gear. It uses a synchronous vibrator unless my analysis of the circuit it way off. My plan is to build a circuit to replace the vibrator with a couple of power FETs driven by a 555 osc and a bridge rectfier to handle rectification of the output. I was wondering if there were any circuit designs around before I started to reinvent the wheel. Also what freqency do they use. Seems like I heard 100Hz at one time but I dont trust my memory on something I learned 40 years ago. Any help would be much appreciate. The earliest replacements would have been a couple of power transistors on a heatsink, with a few resistors and capacitors, relying on the existing transformer for feedback (and frequency control). Of course a lot of early power inverters were about the same, save that they weren't built around a vibrator supply. Look in forty year old ARRL Handbooks, I'm certain the 1971 edition (the first I ever saw) has a simple inverter that is on that level. I'm sure some built fancier ones, but I'm sure many got by with something pretty simple. SOme small companies that deal in antique radios sell virbrator replacements. Michael VE2BVW Yes, there are several schematics on the web for solid state vibrator replacements, but most are too simplistic and are prone to failure due to unsuppressed transients destroying the semiconductors. There is one that appears to be a good design at http://antiqueradios.com/gallery/v/temp/VIBRA2.jpg.html. The component values are all indicated on the schematic. The circuit can be built into a salvaged vibrator can. Be sure to provide some method of heatsinking for the transistors. The only drawback that I can see with this circuit is the lack of "dead time", that is, a short time interval at the switching point to keep both transistors from conducting at the same time. A more involved design might be able to eliminate that problem. This circuit is the one I would build if I were in need of a vibrator replacement. -- David dgminala at mediacombb dot net |
#5
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Vibrator power supply
Michael Black wrote:
On Fri, 4 Nov 2011, JIMMIE wrote: I came by what appears to be a power supply module from some old military gear. It uses a synchronous vibrator unless my analysis of the circuit it way off. My plan is to build a circuit to replace the vibrator with a couple of power FETs driven by a 555 osc and a bridge rectfier to handle rectification of the output. I was wondering if there were any circuit designs around before I started to reinvent the wheel. Also what freqency do they use. Seems like I heard 100Hz at one time but I dont trust my memory on something I learned 40 years ago. Any help would be much appreciate. The earliest replacements would have been a couple of power transistors on a heatsink, with a few resistors and capacitors, relying on the existing transformer for feedback (and frequency control). Of course a lot of early power inverters were about the same, save that they weren't built around a vibrator supply. Look in forty year old ARRL Handbooks, I'm certain the 1971 edition (the first I ever saw) has a simple inverter that is on that level. I'm sure some built fancier ones, but I'm sure many got by with something pretty simple. SOme small companies that deal in antique radios sell virbrator replacements. Michael VE2BVW Here's a circuit that uses a digital gate to provide the "dead time" needed to protect the transistors. http://www.portabletubes.co.uk/sitefiles/ausbatt.htm -- David dgminala at mediacombb dot net |
#6
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Vibrator power supply
On 11/04/2011 10:17 AM, JIMMIE wrote:
I came by what appears to be a power supply module from some old military gear. It uses a synchronous vibrator unless my analysis of the circuit it way off. My plan is to build a circuit to replace the vibrator with a couple of power FETs driven by a 555 osc and a bridge rectfier to handle rectification of the output. I was wondering if there were any circuit designs around before I started to reinvent the wheel. Also what freqency do they use. Seems like I heard 100Hz at one time but I dont trust my memory on something I learned 40 years ago. Any help would be much appreciate. Jimmie I believe that military equipment was 400 hz... (if so, the xfmr would not be usable at 60hz) If it's in working condition it would be easy enough to check. |
#7
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Vibrator power supply
philo wrote in :
On 11/04/2011 10:17 AM, JIMMIE wrote: I came by what appears to be a power supply module from some old military gear. It uses a synchronous vibrator unless my analysis of the circuit it way off. My plan is to build a circuit to replace the vibrator with a couple of power FETs driven by a 555 osc and a bridge rectfier to handle rectification of the output. I was wondering if there were any circuit designs around before I started to reinvent the wheel. Also what freqency do they use. Seems like I heard 100Hz at one time but I dont trust my memory on something I learned 40 years ago. Any help would be much appreciate. Jimmie I believe that military equipment was 400 hz... (if so, the xfmr would not be usable at 60hz) If it's in working condition it would be easy enough to check. Well the 400 Hz is a bit odd for a vibrator pack. Are you sure that the supply wasn't designed for 400Hz AC? That could be explained by use in Aircraft where 400HZ supply is quite common. Most mechanical vibrators actually do run at about 100 Hz. I have built solid state replacement for several and they all had that in common. Of course the builder could have used a 400 Hz transformer, but that wouldn't match a normal vibrator at all. BTW the old Marconi spark transmitters (like on the Titanic) used a 400HZ tuned keying relay to protect the operator. Just like a modern zero crossing switch! Cliff wright ZL1BDA ex G3NIA |
#8
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Vibrator power supply
On Nov 12, 5:08*am, clifford wright
wrote: philo wrote : On 11/04/2011 10:17 AM, JIMMIE wrote: I came by what appears to be a power supply module from some old military gear. It uses a synchronous vibrator unless my analysis of the circuit it way off. My plan is to build a circuit to replace the vibrator with a couple of power FETs driven by a 555 osc and a bridge rectfier to handle rectification of the output. I was wondering if there were any circuit designs around before I started to reinvent the wheel. Also what freqency do they use. Seems like I heard 100Hz at one time but I dont trust my memory on something I learned 40 years ago. Any help would be much appreciate. Jimmie I believe that military equipment was 400 hz... (if so, the xfmr would not be usable at 60hz) If it's in working condition it would be easy enough to check. Well the 400 Hz is a bit odd for a vibrator pack. Are you sure that the supply wasn't designed for 400Hz AC? That could be explained by use in Aircraft where 400HZ supply is quite common. Most mechanical vibrators actually do run at about 100 Hz. I have built solid state replacement for several and they all had that in common. Of course the builder could have used a 400 Hz transformer, but that wouldn't match a normal vibrator at all. BTW the old Marconi spark transmitters (like on the Titanic) used a 400HZ tuned keying relay to protect the operator. Just like a modern zero crossing switch! Cliff wright ZL1BDA ex G3NIA Clifford, would you share schematic of the one you built. Im using my function generator to drive a flip-flop to drive a pair of power FETs. Seems to be working but I would like to see someone elses design. BTW this thing seems to work from 50 to 500 HZ. There is also a winding on it that may be an input to run it off the mains. Not sure of that yet as I have never seen one before. Jimmie |
#9
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Vibrator power supply
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#10
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Vibrator power supply
On Mon, 21 Nov 2011, Howard Eisenhauer wrote:
NOS vibrators are avaialble from Leeds Radio- http://leedsradio.com/parts-odds.html Hey, weren't they just featured in the New York Times? Michael VE2BVW |
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