Search results

  1. (*steve*)

    A new project for me

    I saw this thing on ebay... Labeled as "Aviation Signal Tracer Vintage RF Gear" and with a description of "Have no info on this one other that it was purchased as a single item from a deceased estate from a relative of the deceased. They were keen for it to find purpose. I had intentions to...
  2. (*steve*)

    Hello, Welcome! (Introduce yourself)

    Hi Ike
  3. (*steve*)

    Rohde & Schwarz Transcope MUF 2 Manual

    Thanks Bertus! I actually just found that myself and it answered most of my questions. But I'll give the win to you, because you found it 15 minutes before I did :-)
  4. (*steve*)

    Rohde & Schwarz Transcope MUF 2 Manual

    As in the title. I'm trying to find a manual for a Rohde & Schwarz Transcope MUF 2. Any help would be appreciated.
  5. (*steve*)

    Lithium Ion 18650 cell capacity

    A constant current sink would be better. Also you want (in your example) about 5.8 ohms. Two 11.5 ohm resistors (not a standard value) would be close. 4 22 ohm resistors in parallel would be close enough. Two 7 ohm resistors (again, not a standard value) would give you 3.5 ohms, and a...
  6. (*steve*)

    Hello, Welcome! (Introduce yourself)

    I'm sure I can perceive a joke there about "happy endings", but I don't wish to make it. Welcome!
  7. (*steve*)

    Diode id request (New Member)

    It would also be useful if you can determine what the power rails are and where this diode sits in relation to them. (e.g. is it in series with one of them, across them, or tied at one end to one of them, or something else)
  8. (*steve*)

    Diode id request (New Member)

    OK, one of the alternatives is that it is a TVS diode, and this would explain what you see. Do you know what voltage exists across this diode with the unit powered on? Diodes generally fail short circuit rather than open, so I'd tend not to suspect this unless you have a good reason to. It...
  9. (*steve*)

    Diode id request (New Member)

    One option is a 1PMT5933B. This is a 22V 2.5W zener diode. the case for this is DO-216AA, and I'm not sure that looks like that. What makes you think it is at fault? Is it shorted? Which end of the diode is more positive? (and what is the voltage drop across it)
  10. (*steve*)

    COVID-19

    Our state now has Covid-19 in the community. Pretty much everyone is triple vaxed. I believe we have zero deaths from vaccination in our state and only a very few who have had severe reactions (but there's only about 2 million of us). It's only just starting, with a couple of hundred new...
  11. (*steve*)

    PM 5192 ressurection

    The service manual can be found here: https://www.valuetronics.com/product/pm5192-philips-function-generator-used#manuals And a manual for the PM5193 (same unit except it goes to 50MHz is here: https://isurplus.com.au/manuals/Philips%20PM5193%20User%20Manual.pdf Hope this helps
  12. (*steve*)

    Heathkit Condenser Checker

    It's behaving quite well :) Another project was adding a method of reading the actual leakage current in a safe way. This is a two edged sword. On the one hand, I can tell you to a fraction of a uA what the leakage current is, but on the other hand it's not a go/no-go test any more :-D...
  13. (*steve*)

    Electronics Hobby Magazines

    They also have a digital delivery option. That might be useful too. At the very least, you won't have to wait for the postage to arrive.
  14. (*steve*)

    VARIAC? With valves!

    Thanks a lot @MHW That is GREAT information. Please keep us updated as to when the website with the historical information will be available to look at.
  15. (*steve*)

    Electronics Hobby Magazines

    Australia has Silicon Chip and Diyode
  16. (*steve*)

    class A push - pull amplifier ?

    ROFL, I see you have a sense of humour. The questions I've seen you refuse to answer call into 2 categories. Questions asking you what this is for. These are asked because it can actually make a difference between good and bad advice. Questions if legality. It is our policy not to assist...
  17. (*steve*)

    How to identify pins

    One way is to look at the datasheet for the transistor. Another way is to use a multimeter on the ohms range or diode check range to measure the base-emitter and base-collector forward resistance/voltage. The base-emitter junction will likely have a higher voltage drop (or resistance) than...
  18. (*steve*)

    Does 1/4W metal film resistor have a resistance of 100M ohms?

    What do you want the circuit to do?
  19. (*steve*)

    Does 1/4W metal film resistor have a resistance of 100M ohms?

    See the following circuit using a 1G resistor in a similar circuit http://www.vk2zay.net/article/251
  20. (*steve*)

    Does 1/4W metal film resistor have a resistance of 100M ohms?

    Looks like an integrator Given the input impedance of that op amp is around 10^13 ohms, 100M isn't a lot. Sure you need good construction technique (and actually need this circuit) but there's not that much weird with it. (There are similar circuits with much higher resistances) A...
Top