Modifying the circuit for better Vpp control


I needed finer control of Vpp.  Since this is an experimental design, I decided to make some calculated guesses to choose the right values.

To start with, I believe that putting a resistor between the emitter and ground of the feedback transistor will limit the gain of the transistor.  The voltage of this resistor will rise as the current through it increases limiting the current gain of the circuit.  The first guess I tried was calculating the resistor as if the transistor wasn’t there(same as fully saturated) for my max voltage (25 V).

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The Man in the Arena

It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat.  –Theodore Roosevelt

This blog is one way I have stepped into the “Arena”.  Of course the dust and sweat and blood are only figurative for me. All that I risk is my pride, and reputation.  Thinking of myself a little less often is always a worthy goal.  My reputation is how I build my client base.  Risking my reputation can have a negative impact on my income.

I was reminded this week that taking risk has some advantages. I listen to multiple podcasts each week.  On the Photography Tips From The Top Floor podcast, Chris mentions that he only does most photo tours “twice only” and refers to an article that explains why.  This article reminded me that by taking chances I am stretching myself, and adding a little spice to what I do.

A software engineer has reminded me several times “If it were easy, anybody could do it.” Just because something is difficult, doesn’t mean I shouldn’t try.  I should weigh the value of trying and failing against “Aiming at nothing” and succeeding. Often, trying and failing is more valuable than not trying. Sometimes the difficult project has very little value to me even if I succeed.

Recently I have been working on a project that requires knowledge of web development.  Because I haven’t had any experience with web protocols, this has been a difficult project.  I didn’t shy away from the project because it was difficult.  However, I have found that I don’t like working in that world. For future projects when web protocols are required, I will hire out that part of the project or not take that part on in the first place.

From this experience, I am still willing to take chances, like making a voltage boost circuit without any experience.  I have also learned an area of programming that I should leave to other professionals.  This voltage boost circuit has been a great learning experience and I am still learning.  I had no idea whether I would be able to make it work or not.  I hope I have encouraged you to take a chance and try something difficult to do.

I have not received any negative comments.  Very few comments at all really.  After doing this for over a year, I had anticipated more interaction with you the readers.  How have you taken a risk recently?  Did you learn from it?  Did you succeed or fail on your goal?