Search found 2219 matches

by Robert Reed
Thu Oct 08, 2015 5:40 pm
Forum: General Discussion
Topic: Self entertaining, entertainment system!
Replies: 29
Views: 3212

Re: Self entertaining, entertainment system!

You are experiencing the definition of HI TECHNOLOGY-

"Something that does not work quite right yet!"
by Robert Reed
Mon Mar 02, 2015 4:15 pm
Forum: General Discussion
Topic: Another transformer question... ( trivia question)
Replies: 6
Views: 26378

Re: Another transformer question... ( trivia question)

AC- looks like you are good to go. And especially, if its just sine wave to sine wave, VA will hardly be a factor.
by Robert Reed
Mon Mar 02, 2015 8:14 am
Forum: General Discussion
Topic: Another transformer question... ( trivia question)
Replies: 6
Views: 26378

Re: Another transformer question... ( trivia question)

Should be looked at as VA and not watts. Is the secondary load pure AC or DC? If DC with capacitor input filter, the load current will have to be reduced quite a bit. Worst case is with full wave bridges and depending on the setup could reduce allowable current to 50% as compared to a pure AC load.
by Robert Reed
Sun Mar 01, 2015 2:16 pm
Forum: Computer Programming
Topic: HP printer deskjet 9300 issue
Replies: 5
Views: 9689

Re: HP printer deskjet 9300 issue

I had installed Windows 7 in my computer several months ago and my older (but excellent) HP printer would not work any more. This one worked from a install disc that came with it. Win 7 wants internet access to control the computer and will not accept the startup disc. Went on forums and such to fig...
by Robert Reed
Sat Jan 10, 2015 9:27 am
Forum: General Discussion
Topic: Circuitboard construction
Replies: 5
Views: 3456

Re: Circuitboard construction

Thanx for the replys fellows. In reading thru all the threads, I am now a little reluctant to try glue products. The overall board is only2.5" by 3.0", so I may just stick with double sided board and grind away one side to all but the strip desired. There will be 8 SMD components to solder in and al...
by Robert Reed
Wed Jan 07, 2015 6:39 pm
Forum: General Discussion
Topic: Circuitboard construction
Replies: 5
Views: 3456

Circuitboard construction

I need to install a 50 ohm strip line on the resin side of a single clad circuit board. This piece of foil will be approximately 3" long and 1/8" wide and ultimately sectioned off for SMD components. I have never attempted a glue down line and wondering if there is any suitable adhesive that can sta...
by Robert Reed
Mon Oct 13, 2014 10:51 am
Forum: General Discussion
Topic: Schematic diagram for Tektronix probe, please ?
Replies: 11
Views: 3562

Re: Schematic diagram for Tektronix probe, please ?

Hi Externet I might be missing some thing here, but as stated before - the level difference when adding the unknown load (tuner) had a 3db drop which would exactly indicate double terminating of the 50 ohm source Z , hence unknown Z would be 50 ohm. Again, will only be reliable in a perfect test set...
by Robert Reed
Sun Oct 12, 2014 7:11 pm
Forum: General Discussion
Topic: Schematic diagram for Tektronix probe, please ?
Replies: 11
Views: 3562

Re: Schematic diagram for Tektronix probe, please ?

Hello Externet Robert Reed wrote: Are you trying to measure the input impedance of the tuner which we would assume to be 75 ohm. I probably should have phrased this as THEY WOULD ASSUME and not WE WOULD ASSUME. I agree with you that stated impedances probably vary quite a bit especially in wide band...
by Robert Reed
Sun Oct 12, 2014 4:27 pm
Forum: General Discussion
Topic: Schematic diagram for Tektronix probe, please ?
Replies: 11
Views: 3562

Re: Schematic diagram for Tektronix probe, please ?

Are you trying to measure the input impedance of the tuner which we would assume to be 75 ohm. I think you had a posting a while back about trying to do this, but if I remember right you did not have top of the line equipment as you show in the photos. If I am reading this right - you show a 1.5 db ...
by Robert Reed
Sat Oct 11, 2014 3:41 pm
Forum: General Discussion
Topic: Schematic diagram for Tektronix probe, please ?
Replies: 11
Views: 3562

Re: Schematic diagram for Tektronix probe, please ?

Externet
Can't down load your Photo Bucket. Says it does not exist.
by Robert Reed
Fri Oct 10, 2014 12:57 pm
Forum: Lost and Found
Topic: Audio Power Amplifier -- "Electronics" magazine (McGraw-Hill
Replies: 1
Views: 2274

Re: Audio Power Amplifier -- "Electronics" magazine (McGraw-

Can't help you with the magazine Dean, but I have come across several published designs in the past few years ( EDN mag I think) that use that same OP-Amp design. They used 20-30 ohms as their load resistors and I have never heard a good theoretical discussion about using that "twist". Point being, ...
by Robert Reed
Tue Sep 30, 2014 5:59 pm
Forum: General Discussion
Topic: anyone else had this problem ? ceiling fan light going out
Replies: 7
Views: 1403

Re: anyone else had this problem ? ceiling fan light going o

And to add- from my tests, the typical fan motors I have tested uses 13,20 & 27 watts for lo, mid and hi speed. So if one would want 60W bulbs-never turn the fan on- just use it for a ceiling fixture to give adequate lighting when inserting your cel phone into the Microwave Oven :smile:
by Robert Reed
Tue Sep 23, 2014 7:50 pm
Forum: Up For Grabs
Topic: Got ink-No Printer!
Replies: 0
Views: 2573

Got ink-No Printer!

While setting up my old printer for cartridge replacement, it some how went up in smoke from a burnt out driver motor. Now I have three brand new cartridges and no place to put them. These are remanufactured by 1ink.com. I have used their products for two years now and they are of very high quality....
by Robert Reed
Sat Sep 06, 2014 7:21 pm
Forum: General Discussion
Topic: TV Repair musing
Replies: 15
Views: 3058

Re: TV Repair musing

As to SAMS Manuals and old tube type TVs, etc. I do a lot of electronic oriented research on the web at times, and many times the websites direct me to various forums. I am blown away by the specific interests in some of these forums that dwell on old consumer electronics repair and restoration. App...
by Robert Reed
Sun Aug 24, 2014 9:53 pm
Forum: General Discussion
Topic: Schematic diagram for Tektronix probe, please ?
Replies: 11
Views: 3562

Re: Schematic diagram for Tektronix probe, please ?

I am afraid that you are SOL on what you want to do here. The P6105 is a garden variety passive probe with all their shortcomings. Basically a series 9 meg resistor shunted by a 10 pf capacitor at the tip. The comp box at the other end has a variable capacitor to ground that is adjusted in conjuncti...