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inexpensive 600/600 ohm AF transformers

wn4isx #99754 First, I have no financial stake in Electronic Goldmine, I'm just a satisfied customer. ? I needed some transformers for a special project and Electronic Goldmine started offering these. ?Microtran Pico Transformer PM34-M Miniature 600 Ohm C.T. to 600 Ohm C.T. 50mW Rating "Microtran Pico transformer type PM34-M is a miniature fully encapsulated 50mW rated 600 Ohm C.T. to 600 Ohm C.T. transformer. Frequency response is ±2db 300Hz to 100KHz. Has 6 full length leads. Size only 0.3" x 0.4" x 0.425" tall. New" at ? https://theelectronicgoldmine.com/products/g28678 ? Full specs can be found here https://www.technicalaudio.com/pdf/MicroTran/Microtran_miniature_transformers_catalog_1974.pdf ? Electronic Goldmine offers surplus, new old stock, components and probably doesn't have oodles of these. ? 60Hz appears be just over -3dB. YMWV depending on your system. Short pulses of 1 cycle or 1kHz show minimum ringing. ? These could be ideal for coupling a computer to a ham/shortwave radio, PA, or other interface needs. ? ?
Roy J. Tellason, Sr. All Messages By This Member #99756 On Saturday 22 February 2025 05:52:07 pm wn4isx via groups.io wrote: First, I have no financial stake in Electronic Goldmine, I'm just a satisfied customer. I got that when you brought it up before. I needed some transformers for a special project and Electronic Goldmine started offering these. ** Microtran Pico Transformer PM34-M Miniature 600 Ohm C.T. to 600 Ohm C.T. 50mW Rating ** " Microtran Pico transformer type PM34-M is a miniature fully encapsulated 50mW rated 600 Ohm C.T. to 600 Ohm C.T. transformer. Frequency response is ±2db 300Hz to 100KHz. Has 6 full length leads. Size only 0.3" x 0.4" x 0.425" tall. New " Not bad for communications gear, but for more general audio uses that lower end of the frequency response is pretty pitiful. Electronic Goldmine offers surplus, new old stock, components and probably doesn't have oodles of these. I did take a look at their site, lots of interesting junk there. But I really need to deal with the junk I have here first, I think... 60Hz appears be just over -3dB. YMWV depending on your system. Short pulses of 1 cycle or 1kHz show minimum ringing. These could be ideal for coupling a computer to a ham/shortwave radio, PA, or other interface needs. Noted. -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin
wn4isx #99757 I gave quite a few suitable transformers of mixed heritage. But, I was building a project for a friend and decided using the same transformers would make life easier for someone else down the line, probably long after I'm gone. I even included 4 spare transformers.
Nuno T. All Messages By This Member #99759 开云体育 Such transformers, with, and without CT, can be recovered from old computer modems add-in cards. ? Nuno T. ? toggle quoted message Show quoted text From: [email protected] [mailto:[email protected]] On Behalf Of wn4isx via groups.io Sent: 22 February 2025 22:52 To: [email protected] Subject: [electronics101] inexpensive 600/600 ohm AF transformers ? First, I have no financial stake in Electronic Goldmine, I'm just a satisfied customer. ? I needed some transformers for a special project and Electronic Goldmine started offering these. ?Microtran Pico Transformer PM34-M Miniature 600 Ohm C.T. to 600 Ohm C.T. 50mW Rating "Microtran Pico transformer type PM34-M is a miniature fully encapsulated 50mW rated 600 Ohm C.T. to 600 Ohm C.T. transformer. Frequency response is ±2db 300Hz to 100KHz. Has 6 full length leads. Size only 0.3" x 0.4" x 0.425" tall. New" at ? https://theelectronicgoldmine.com/products/g28678 ? Full specs can be found here https://www.technicalaudio.com/pdf/MicroTran/Microtran_miniature_transformers_catalog_1974.pdf ? Electronic Goldmine offers surplus, new old stock, components and probably doesn't have oodles of these. ? 60Hz appears be just over -3dB. YMWV depending on your system. Short pulses of 1 cycle or 1kHz show minimum ringing. ? These could be ideal for coupling a computer to a ham/shortwave radio, PA, or other interface needs. ? ? -- Nuno T.
wn4isx #99760 These were new old stock and I didn't have to desolder a bunch of transformers. I'm as cheap as the next guy, but, at 73 I have to balance the value of my time on this side of the grass against the cost of just buying something and finishing a project that has been hanging on some design changes my friend couldn't decide on, so I decided for him, he can have someone else modify my design if he wants. ?
Roy J. Tellason, Sr. All Messages By This Member #99762 On Tuesday 25 February 2025 03:04:08 am Nuno T. wrote: Such transformers, with, and without CT, can be recovered from old computer modems add-in cards. Yup, that's where I got a number of them. "Winmodems", which are absolutely useless to me. -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

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