On Thu, 9 Nov 2023 16:30:25 -0800 (PST), Klaus Kragelund
<klaus.kragelund@gmail.com> wrote:

>On Friday, 10 November 2023 at 01:15:37 UTC+1, Klaus Kragelund wrote:
>> On Friday, 10 November 2023 at 00:40:13 UTC+1, Lasse Langwadt Christensen wrote:
>> > fredag den 10. november 2023 kl. 00.14.58 UTC+1 skrev Klaus Kragelund:
>> > > Hi
>> > >
>> > > I am on the lookout for a cheap 1:1 pulse transformer. Will be using it to drive a MOSFET based Solid State Switch.
>> > >
>> > why a transformer instead of an isolated driver?
>> > > I know Larkin has used the DRQ127
>> > >
>> > > https://www.digikey.dk/en/products/detail/eaton-electronics-division/DRQ127-1R5-R/667262
>> > >
>> > > But, I am looking to see if I can find bottom dollar.
>> > >
>> > > I probably wont go to LCSC, so would prefer a known brand.
>> > >
>> > > Anyone got a recommendation?
>> > seems to me DK has plenty of 1:1 pulse transformers much cheaper than that double inductor
>> >
>> > https://www.digikey.dk/en/products/filter/pulse-transformers/166
>> Yeah, I was looking at those. But except for LAN transformers, they approach 1USD/pcs, which is awful high
>>
>> I was even thinking doing a planar transformer, but production assembly of ferrites are not straight forward
>Speaking of LCSC, it's quite amazing that one can get a transformer like this for less than 10cents:
>
>https://www.lcsc.com/product-detail/RJ45-Transformer_CND-tek-TF-1601DG_C408875.html

If you stick to core shapes that are used in volume, you can
get volume pricing on any drawing and spec from off-shore mfrs.

CCFL or LED <8W ballasts, or USB wallwarts are a good place to get
an idea of what's used in this market.

That's what north american suppliers do, with ~ 500% mark-up.

.. . . or you can just buy off the shelf from off-shore vendors
with one-time-buy volumes. 10K at $0.10 . . . that's a few day's
tech labor in NA . . less than you will probably spend to process
the paperwork.

Sigh.

RL