The items listed below are surplus to my needs and I would like to find a new home for them. Some would be free and the rest very cheap.
I am not a seller of electronics parts and do not engage in this type of commercial activity. I just have things acquired over the years, which I want to be rid of.
I do not want to mail the heavy iron stuff so pickup in Chapel Hill NC is the only alternative.
Contact me if you are interested in any item: fbw4npn@gmail.com
If you intend to build a power supply, this information page might be of interest.
Filter Chokes:
Filter Choke 6Hy, 30ma, potted, nice. $2
Filter Choke 6Hy, 90ma, potted, nice. $2
Transformers – these are high quality potted units that are built for Constant Commercial Service (CCS), so they will give a few more milliamps in amateur service (ICAS) (see descriptions below):
T3: 115 VAC primary, Secondary windings are 24V-500ma; 5V-2A; 6.3V-3A; 5V-2A; 6.3V-4A; 6.3V-2A; 6.3V-1.5A. Put some of these windings in series and make a good shop power supply for your projects.
T4: 115 VAC primary, Secondary winding is 5V-2A; 850-0-850V, 50ma.
T5: 115 VAC primary, Secondary windings are 5V-2A; 850-0-850V-30ma; 577-0-577V-0.5A.
Misc Xfmrs: Several removed from UPS units; 12 VAC primaries, 120 VAC secondaries. Run them backwards with up to 20 VAC on the 12 volt winding to get up to 200 VAC from the primary.
With a capacitor input filter system the 200 volt winding will produce 280 volt DC, or using a voltage doubler, a 560 volt DC system. These are 450 or 750 or 1000 watt units so you can safely derate them a bit and have fun powering a home-built xmtr.
Or you can put 120 VAC on the 120 volt winding and will actually get about 14 VAC on the low voltage winding. Using a LDO regulator, you can make a nice 0-12 volt variable supply for your workbench or to power a small solid state xmtr.
Misc Xfmrs: Several microwave transformers: about 2100 volt secondaries (use for an 813 linear amp?). Removed from 1000 – 1200 watt microwaves. Or remove and rewind the secondary with about 16 turns of #14 stranded house wire for a nice 13.5 volt linear power supply. These provide about 1 volt per turn so you can create any secondary voltage you want.
I’ve been using one rewound with a #14 house wire secondary for my 13.5 VDC Yaesu power supply using a variable voltage regulator circuit and several pass transistors, for many years. It was removed from a 1000 watt microwave and never gets hot.
Note that the primary winding of these transformers is quite heavy duty and that turning them on at exactly the wrong part of the AC input wave might trip the house breaker. Microwave ovens use “soft-start” circuitry to avoid this and you can remove the soft-start circuit from the microwave oven you are junking, or just put an adequately sized thermistor in the primary lead to slow down the starting AC pulse.
Even simpler: Feed 120 VAC into the secondary of a MOT and get about 7 volts from the very heavy-wired (10 amps x 120VAC typical) primary. Use a voltage doubler rectifier circuit to increase the 7 volts to about 18-19 volts. With a simple voltage regulator system, this can easily be dropped to 13.5 volts. The transformer is probably rated for 1000 watts so it will run cool and not saturate if it powers typical ham gear.
Misc Xfmrs: A couple of VERY high amp low voltage xfmrs; we’d have to check these, I think I remember that at least one is good for a 50+ volt supply for a mosfet amplifier. Or whatever you need.
Misc Xfmrs: Lots of low and medium voltage units – what do you need?
Quite a few tubes; used but good:
Voltage regulator tubes, all voltages
Many rectifiers; 5U4, 5Y3, 5R4, six volt tubes, etc
Lots of audio tubes – 12A*7 family,
6U8’s, 6AL5’s, 6AU6, 6AH5, many others.
Some NOS 807’s
Bathtub capacitors and Mica “transmitting” capacitors (a.k.a. “condensors”):
Lots of these in good condition, from old commercial and military gear – what do you need?
Wm N. Nye telegraph key…like new. $5
J38 WWII era telegraph key…$8