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 on: May 18, 2017, 03:46:04 PM 
Started by Panometric - Last post by CDRIVE
I don't have Tina TI, so I don't know what AC Analysis options it provides. It will certainly be less than what Tina11 Classic DS provides. I do know that my version of AC Analysis provides the following..

Calculate Nodal Voltages
Table Of AC Results
AC Transfer Characteristic
Phasor Diagram
Time Function
Network Analysis

None of which is relevant to what you want to measure. That should be done in Transit Analysis.


 on: May 18, 2017, 02:25:39 PM 
Started by SirCut - Last post by horvatht
I've checked this circuit in Tina 9 and it worked for me, the oscillator started to oscillate with a decreasing amplitude of oscillation.

 on: May 18, 2017, 02:22:53 PM 
Started by etl17 - Last post by horvatht
Here you can find the list of new features in Tina 11.1. Besides the new features and components this free update also contains bug fixes.

 on: May 18, 2017, 12:52:32 PM 
Started by Panometric - Last post by Panometric
I found my answer, for the record: It is not the unaccounted for input signal or enable bias, those are both very high impedance, so inconsequential. And I don't have the interactive transient option since this is Tina-TI.

The issue is that the analyzer is instantaneous and always starts at T0. To get the average power I had to:
1. Make the battery non-ideal by adding some internal resistance.
2. Put a large cap between the meter and the circuit to integrate the power.
3. Use the power from the transient chart sometime after T0 where it levels off. The power printed on the schematic is always wrong.

Now I see each supply has an average consumption of 1W, so the circuit is about 50% efficient, that is what I expected.

If there was an easier way to just get that on the screen as part of the AC analysis,  it would be nice to know.

 on: May 18, 2017, 09:49:19 AM 
Started by Panometric - Last post by etl17
It seems that you have two additional sources of energy that you are not accounting for.
The signal generator in the input, as well as, the additional 4.2V source.

 on: May 17, 2017, 07:28:09 PM 
Started by Panometric - Last post by CDRIVE
Well that wasn't what I meant by a Screen Shot (Print Screen) in my last post. I was referring to Transit (Interactive Mode).

What you have in your last post is the most accurate method of simulating. Your image is of Transit 'Plot Mode'. All those waveforms are peak values because they're instantaneous values like a scope measures. You can convert Peak values to RMS by multiplying the value at any point by 0.707.

BTW, when you punch in voltage levels on Tina AC Voltage and Current sources the value you enter is also a Peak value. So if you ever find yourself simulating a power transformer (Mains Power) and your powering it with a AC Voltage Source/Gen you have to keep that in mind.
For example: Setting up a Tina Voltage Gen for 120VAC Mains Power would require the Sinewave voltage to be set at 120V * 1.4143. More precise methods can be   found on the net. Just Google "RMS to Peak Converter".


 on: May 17, 2017, 06:00:57 PM 
Started by Panometric - Last post by Panometric
Thanks for the tip Chris.

Ahh, I see that the probed figure is for t0, the transient analysis shows the peak power alternating form the expected supply. That is very misleading.
So I am probably analyzing wrong.  How do I get peak and average power over at least one waveform cycle?

 on: May 17, 2017, 05:40:21 PM 
Started by Panometric - Last post by CDRIVE
Here's what I did. While running in Interactive Transit mode take a screen shot and view it in Paint. . I rely on AC interactive mode for very few simulations.


 on: May 17, 2017, 05:18:48 PM 
Started by Panometric - Last post by CDRIVE
In DC (Interactive) the speaker should dissipate 0W and that's exactly what I get in my Tina11.


 on: May 17, 2017, 02:12:58 PM 
Started by Panometric - Last post by Panometric
Whats wrong here? The circuit is dissipating 1W into the speaker, yet the total consumption of the power supplies is less than 1 watt.  Interestingly I get the same consumption on the supplies whether doing AC or DC analysis. Even adding all AC and DC together is still < 1 Watt. Hopefully you will tell me I invented a perpetual energy machine ;-)

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