A New Transformer Design?

[Ron Hubbard]

I've been using a standard Radio Shack miniature center-tapped 1K:8 ohm
audio transformer in a push-pull transistor configuration to drive a
piezo element to get about 143 dB of sound. But RS has discontinued this
useful little xformer and I want to replace it with something better.
Does anyone know the turns ratio to step 3 volts up to about 100 volts?

 

[OBones]

Ron Hubbard wrote:

I've been using a standard Radio Shack miniature center-tapped 1K:8 ohm
audio transformer in a push-pull transistor configuration to drive a
piezo element to get about 143 dB of sound. But RS has discontinued this
useful little xformer and I want to replace it with something better.
Does anyone know the turns ratio to step 3 volts up to about 100 volts?

let's see... 3 to 100... What about 1:33 ?

 

[Dwayne]

"Ron Hubbard" <notat@hotmail.com> wrote in message
news:117mg3abnm0f3cc@corp.supernews.com...

I've been using a standard Radio Shack miniature center-tapped 1K:8 ohm
audio transformer in a push-pull transistor configuration to drive a
piezo element to get about 143 dB of sound. But RS has discontinued this
useful little xformer and I want to replace it with something better.
Does anyone know the turns ratio to step 3 volts up to about 100 volts?


3V : 100V -> 1 : 33.333

Dwayne

 

[Rich Grise]

On Fri, 06 May 2005 23:31:49 +0000, Dwayne wrote:

"Ron Hubbard" <notat@hotmail.com> wrote in message
news:117mg3abnm0f3cc@corp.supernews.com...
I've been using a standard Radio Shack miniature center-tapped 1K:8 ohm
audio transformer in a push-pull transistor configuration to drive a
piezo element to get about 143 dB of sound. But RS has discontinued this
useful little xformer and I want to replace it with something better.
Does anyone know the turns ratio to step 3 volts up to about 100 volts?


3V : 100V -> 1 : 33.333

Yes, of course, but how do you manage that last .333 of a turn?

;-)
Rich

 

[John Fields]

On Sat, 07 May 2005 16:18:41 GMT, Rich Grise <richgrise@example.net>
wrote:

On Fri, 06 May 2005 23:31:49 +0000, Dwayne wrote:

"Ron Hubbard" <notat@hotmail.com> wrote in message
news:117mg3abnm0f3cc@corp.supernews.com...
I've been using a standard Radio Shack miniature center-tapped 1K:8 ohm
audio transformer in a push-pull transistor configuration to drive a
piezo element to get about 143 dB of sound. But RS has discontinued this
useful little xformer and I want to replace it with something better.
Does anyone know the turns ratio to step 3 volts up to about 100 volts?


3V : 100V -> 1 : 33.333


Yes, of course, but how do you manage that last .333 of a turn?

---
You don't. If you want it to come out exactly right you wind the
low-voltage side in multiples of three turns.


--
John Fields
Professional Circuit Designer

 

[Ron Hubbard]

"Tim Shoppa" <shoppa@trailing-edge.com> wrote in message
news:1115380564.540473.69990@o13g2000cwo.googlegroups.com...

RS has discontinued this useful little xformer

Mouser still has plenty, like 42TC013, 42TL013, and 42TM013 (going
smallest to largest). The middle-size is only $1.37.

Tim.

Thanks, Tim; I'll check them out.

Ron