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Recent content by maark6000

  1. M

    Doorbell needs to be stepped up to 24v for Ring, but what about solenoid in chime?

    thank you all for the great information. This is the transformer I bought... https://www.amazon.com/Edwards-Signaling-598-120V-Transformer/dp/B007B79HR2/ref=sr_1_1?ie=UTF8&qid=1529556368&sr=8-1&keywords=edwards+24v+transformer+doorbell it says it has "Non-regenerative thermal overload...
  2. M

    Doorbell needs to be stepped up to 24v for Ring, but what about solenoid in chime?

    Ha, okay... what the heck is a VA? yes, the transformer is 30 VA. How did I get through electronics school (ahem, self taught) without ever hearing of a VA? Included picture of my simulation showing 28 Amps. <a href="https://imgur.com/CHQXObc"><img src="https://i.imgur.com/CHQXObc.png"...
  3. M

    Doorbell needs to be stepped up to 24v for Ring, but what about solenoid in chime?

    Thanks for the replies. Klaus, i have looked for a datasheet and was not able to find one. This doorbell ringer is circa 1961... the model number doesn't even turn up in a google search. I've ordered a 24V transformer capable of 30A. That seems like an amazing amount of current... I think I...
  4. M

    Doorbell needs to be stepped up to 24v for Ring, but what about solenoid in chime?

    Hello all, my house's doorbell circuit uses a 10:1 step-down transformer... I'm getting 11.6 Vac on the secondary. Problem is if I want to install and power a Ring doorbell unit (Pro), it requires 16-24 Vac. It's easy enough to order a 24V transformer... but if the Nutone chime is designed to...
  5. M

    Popular PIC18F chips in 2016

    Hello all... I am starting to learn the C programming language, and the book I am learning out of strictly uses the PIC18 series, and no PIC16 series. My previous experience has been coding in assembler on the PIC16's, so now I'm a little lost as to which PIC18's to get. If you could please...
  6. M

    [SOLVED] in finding an equivalent transistor, what are the important parameters?

    ah, okay, seeing that now. derp! hmm, i suppose if they are still available, i should just get the same part. Also, according to mouser's datasheet, it looks like the 2N2924 is a closer match as far as hfe goes. I'll just get some of each, if one doesn't work i'll try the other. thanks so...
  7. M

    [SOLVED] in finding an equivalent transistor, what are the important parameters?

    So cool! I just bought one on e-bay for $12. :) - - - Updated - - - can I ask another question regarding the 2N3392? Below is a picture from Mouser's website... apparently one can still buy the 2N3392, although I'm not sure it's the same transistor. Notice the @ Ic (mA) column, why is it...
  8. M

    [SOLVED] in finding an equivalent transistor, what are the important parameters?

    Thank you! Tony, out of curiosity, what is this ancient transistor data book of which you speak?
  9. M

    [SOLVED] in finding an equivalent transistor, what are the important parameters?

    I'm trouble-shooting a pre-amp from a 70's Fender Rhodes electric piano. Pretty simple device... but I realized that I should poke around to see what equivalent transistors I might need. With rare exception, the designer selected 2N3392s for his go-to transistor. Amplification, buffering...
  10. M

    [SOLVED] best practice method of lowering a voltage to meet a component's max?

    okay, yeah, sometimes the easy solution is the best one. thanks all!!!
  11. M

    [SOLVED] best practice method of lowering a voltage to meet a component's max?

    Just curious about something, I'm working with a circuit that has a single sided supply, high rail is 8 volts, low rail is ground. If I have a component (in this case it's a relay) whose max voltage is 5 volts, what is the best way to lower my rail voltage for this component? Obviously I could...
  12. M

    [SOLVED] need some help with JFET signal bypassing (ala old stomp pedals)

    oops, hang on, i realized I was reading the wrong thing on my scope. AC signal at the Source is between 9.4v and 6.3v. Nevermind. :)
  13. M

    Good books on analog mixed signal design

    I can't say exactly what is right for you not knowing your level of education, but I think the following would be a very good beginning covering all aspects of the analog world. These are textbooks, and I highly recommend you get the lab books that go with them and do the labs as well...
  14. M

    [SOLVED] need some help with JFET signal bypassing (ala old stomp pedals)

    okay, i built the above circuit and WOW!, that's looks good. My scope can't even measure the signal when the JFET is off at lower frequencies (300 Hz). I do notice that at higher frequencies (5k) you start to see a small signal. So I have two questions... as my scope measures it at the...
  15. M

    [SOLVED] need some help with JFET signal bypassing (ala old stomp pedals)

    I think for me, since I'm just learning all of this stuff, I'm trying to not purposefully run into clipping of the signal... I need to learn how to find the right bias points in all sections of this particular pedal, which is a bucket-brigade style delay. :)

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