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MEK is not MEKP... and MEK is not known to be toxic to the liver. Acetone is not as "bad" (whatever that means) as MEK... and acetone is present in the human body, and disposed by it, during normal

Let's see, 62 ohm resistor (that feels like a 1/10 watt just to start), input capacitance of some sort (20 pf, but you'd think that wouldn't be much), feed the scope RF.? 27 Mhz, 20pf gives about 294

Thank you so much Jim, therefore your 52.5 MHz crystal cannot be used to convert the TR503 to TR502. Patience I will try to find a TR502. I thank you for the help you have given me. --Cheers Attilio

I see no significant advantage to a group purchase of the wafer switch for this tester. DigiKey has 100+ available and the discount for a quantity purchase is not that much. Further, it is likely that

My many thanks to Dennis for a job well done. From a PhD in EE, I want to thank you for all the work that you have done. I will think of you and your efforts when I read and enjoy his book!! Marvin

Colin, I don't know a cost yet for the board set and I am not sure I can get an accurate estimate of shipping to the UK. My experience shipping to Europe is that it cost a *lot* more than our domestic

Walter, I suppose it is possible that U112 has beefy input protection (diode clamps to the supplies?) that might survive enough current to burn a small 62 ohm resistor. At maximum sensitivity the

I have a nice looking Tek 2247A scope here that has been sitting on the shelf for a while, due to a bad Channel i input. the signal is a horribly attenuated and differentiated replica of the actual

I put the BD911(NPN) and BD912(PNP) in mine. D44H10 TiP73 (B or C) and D45H10 TIP74 (B or C) should also work OK

Dennis I have some of those laser PSU, 12V input I think. Please PM if you want more info, photos etc. Jon

Greetings Attilio - I did some research on the 502, and the xtal that tek used. It is a SC cut 3d overtone series resonant crystal in a TO-5 transistor package. Bliley Crystal in the US still might

Hi Vince, I included the model number in my original post but I had no success locating information on it SNIP < Model: 1150-6330, S/N: 610574> Dennis Tillman W7pF

If you want to kill your liver, soak your hands in MEK. Acetone and lacquer thinner are just as bad. All can be very destructive on components. A considerable time ago when I was frequently reverse

I would second all of the suggestions to obtain a new supply... But, for forensic purposes, and because it has not yet been mentioned, I have heard of Methylene Chloride being used in de-potting.

Jim Mcvein, do you have any news for me in relation to 52.5 MHz crystal? I am in Italy, if you give me your bank details and the amount I have to pay for the crystal and the shipping costs, I will

On Thu, Dec 31, 2020 at 03:12 PM, Larry McDavid wrote: > > Anyone interested in buying sets of boards to share? > > Larry > Show quoted text ( #quoted-178120155 ) > > On 12/31/2020 11:27 AM, Jared

I was mistaken to say Media Rate mail does not have tracking numbers. I just looked at the 84 inch (2.13m) long receipt I received and discovered that each of the 72 packages I mailed does have a

Wouldn't my idea of bringing the connections separately to the front panel solve this? Continuity between each end of each 25 VAC winding could be tested without the mainframe being powered up. Colin.

During the early days of satellite video descrambler hacking (Videocypher module) a friend of mine was quite active doing this work and it entailed replacing a chip that I think was a 27xx ROM. At

Does that include checking that the floating AC windings are really floating ? I have had a TM503 with one end of one of the windings in one compartment shorted to ground. Voltages looked OK but the