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2N3904 B-E junction as fast diode substitute?
Chuck Harris wrote: My family visited Florida the first time in '66, when I was 13. Two of my cousins got into a fight, and one threw their dad's transistor radio at the other. Parts went everywhere!
Chuck Harris wrote: My family visited Florida the first time in '66, when I was 13. Two of my cousins got into a fight, and one threw their dad's transistor radio at the other. Parts went everywhere!
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By
Michael A. Terrell
· #179257
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2N3904 B-E junction as fast diode substitute?
Ed Breya via groups.io wrote: There was a 15 transistor radio on the market around 1970.Only six were active. The rest had all three leads soldered together.
Ed Breya via groups.io wrote: There was a 15 transistor radio on the market around 1970.Only six were active. The rest had all three leads soldered together.
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By
Michael A. Terrell
· #179235
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Help replacing a resistor/inductor in SG503
Jim Ford wrote: Probably createted by an MBA who had never even seen the \actual components.
Jim Ford wrote: Probably createted by an MBA who had never even seen the \actual components.
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By
Michael A. Terrell
· #179230
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Help replacing a resistor/inductor in SG503
Dave Seiter wrote: That was another problem. Any new system would have to contain references to old part numbers, since some equipment was still in use 24/365.25 for over 30 years and most still runni
Dave Seiter wrote: That was another problem. Any new system would have to contain references to old part numbers, since some equipment was still in use 24/365.25 for over 30 years and most still runni
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By
Michael A. Terrell
· #179213
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tunnel diodes retrace lines in curve tracer
Brad Thompson wrote: It was being shown on Decades TV, not long ago. It might still be. Two episodes, M-F from 7-9PM, EST.
Brad Thompson wrote: It was being shown on Decades TV, not long ago. It might still be. Two episodes, M-F from 7-9PM, EST.
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By
Michael A. Terrell
· #179180
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PG506 of solid gold
- wrote: I was at an auction years ago, and won some equipment. The guy I beat was mad. The next item up for bid was used IBM banking equipment. I bid $1 for a Gaylord full of assorted tiny monitors a
- wrote: I was at an auction years ago, and won some equipment. The guy I beat was mad. The next item up for bid was used IBM banking equipment. I bid $1 for a Gaylord full of assorted tiny monitors a
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By
Michael A. Terrell
· #179166
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P6021 Noise Problem?
Chappy wrote: It's quite possible. A microwave diode and a foot of wire for an antenna can let you se when the signal is the strongest, on another channel. Years ago, an EE in Orlando mentioned a cons
Chappy wrote: It's quite possible. A microwave diode and a foot of wire for an antenna can let you se when the signal is the strongest, on another channel. Years ago, an EE in Orlando mentioned a cons
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By
Michael A. Terrell
· #179078
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1L10 crystal needed (Newbie)
Joel B Walker wrote: If all else fails, you could use a DDS module with a small controller like the Aurdino Nano, or even smaller to program the DDS on power up. You can not only program the frequency
Joel B Walker wrote: If all else fails, you could use a DDS module with a small controller like the Aurdino Nano, or even smaller to program the DDS on power up. You can not only program the frequency
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By
Michael A. Terrell
· #179041
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Semtech HV multipliers + more....
walter shawlee wrote: Walter, your link for Allen Industries go to a page that says the domain is for sale.
walter shawlee wrote: Walter, your link for Allen Industries go to a page that says the domain is for sale.
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By
Michael A. Terrell
· #179027
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Cleaning Scratchy Bourns MOD pots
Dennis Tillman W7pF wrote: Microdyne used Accurate Screw Machine Company for electronics type hardware for our products. They have a very wide array of stock items, and can make special hardware for p
Dennis Tillman W7pF wrote: Microdyne used Accurate Screw Machine Company for electronics type hardware for our products. They have a very wide array of stock items, and can make special hardware for p
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By
Michael A. Terrell
· #179020
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Help replacing a resistor/inductor in SG503
Tom Lee wrote: I was interviewed for component engineer at my last company. The head of engineering wanted a whole new part number system. for resistors, he wanted to use the resistance . He got mad w
Tom Lee wrote: I was interviewed for component engineer at my last company. The head of engineering wanted a whole new part number system. for resistors, he wanted to use the resistance . He got mad w
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By
Michael A. Terrell
· #179005
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93 Ohm feed-thru terminators - Unobtanium? No, as it turns out.
David C. Partridge wrote: Yes. RG62. Prior to IBM, it was used for car radio antennas which act as a voltage probe rather than a tuned antenna.
David C. Partridge wrote: Yes. RG62. Prior to IBM, it was used for car radio antennas which act as a voltage probe rather than a tuned antenna.
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By
Michael A. Terrell
· #178747
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Waking a slumbering 475
Jeff Dutky wrote: news:sci.elctronics was replaced by the various subgroups by the Time I went online in the late '90s, and not carried on the Usenet servers that I had access to. I only saw it when i
Jeff Dutky wrote: news:sci.elctronics was replaced by the various subgroups by the Time I went online in the late '90s, and not carried on the Usenet servers that I had access to. I only saw it when i
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By
Michael A. Terrell
· #178620
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Waking a slumbering 475
Jeff Dutky wrote: Have you tried Google Groups? They have the entire original usenet archive as their starting point.
Jeff Dutky wrote: Have you tried Google Groups? They have the entire original usenet archive as their starting point.
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By
Michael A. Terrell
· #178605
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Waking a slumbering 475
Roy Thistle wrote: Back in the '60s it was common practice to power a 110 volt item from a 12 or 24 Volt transformer for a few days to warm the equipment's transformer up to evaporate any moisture bef
Roy Thistle wrote: Back in the '60s it was common practice to power a 110 volt item from a 12 or 24 Volt transformer for a few days to warm the equipment's transformer up to evaporate any moisture bef
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By
Michael A. Terrell
· #178602
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CSA, UL/ULC and CE approvals for Tek gear
Chuck Harris wrote: A POTS line is current limited to a very low current. The phones were current modulated by a carbon microphone, and the 20 Hz ringer was a resonant circuit so iyt could be excited
Chuck Harris wrote: A POTS line is current limited to a very low current. The phones were current modulated by a carbon microphone, and the 20 Hz ringer was a resonant circuit so iyt could be excited
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By
Michael A. Terrell
· #178471
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CSA, UL/ULC and CE approvals for Tek gear
Milan Trcka wrote: Medical is a whole different ballgame from test equipment since it comes into contact with the patients. How many remember that the Therac-25's badly written software that killed pa
Milan Trcka wrote: Medical is a whole different ballgame from test equipment since it comes into contact with the patients. How many remember that the Therac-25's badly written software that killed pa
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By
Michael A. Terrell
· #178448
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CSA, UL/ULC and CE approvals for Tek gear
John Williams wrote: Yes, UL is independent The NEC (National Electric Code) was also created by insurance company to set minimum safety standards. They operate on the other end from UL but both are i
John Williams wrote: Yes, UL is independent The NEC (National Electric Code) was also created by insurance company to set minimum safety standards. They operate on the other end from UL but both are i
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By
Michael A. Terrell
· #178416
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CSA, UL/ULC and CE approvals for Tek gear
satbeginner wrote: Some refer to it as 'Can't Enforce' since there are no numbers to follow to the certification, it is too easy to fake.
satbeginner wrote: Some refer to it as 'Can't Enforce' since there are no numbers to follow to the certification, it is too easy to fake.
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By
Michael A. Terrell
· #178405
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was 549 transformer question
Tom Lee wrote: Hilarious! Nice improvisation with the Heathkit. Tom My motto is, Never piss off the Engineer!. When I got to basic I was told I could be a cook or a truck driver. I told off an E8 and
Tom Lee wrote: Hilarious! Nice improvisation with the Heathkit. Tom My motto is, Never piss off the Engineer!. When I got to basic I was told I could be a cook or a truck driver. I told off an E8 and
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By
Michael A. Terrell
· #178289
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