# Tag Info

To add to the answer: As for the likely temperature, Optimal Operating Temperature for Thermal Paper contains: The optimal temperature for thermal paper can vary, but a common range is between 150 ...
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standard PCB manufacturing processes? Define "standard" here. I remember you can very solidly burn your finger on a thermal printer head, so temperatures above 120 °C are likely – and that'...
• 97.4k
Accepted

Modern thermal print heads are typically made with a thin-film process, on a ceramic substrate with glaze. I can't show you the details in a diagram because the document I have is marked "...
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### Why does this MOSFET amplify more and more the longer it runs?

Seems ok for an amplifier at 7 MHz ... Made with microcap v12 Power gain = ~ 130 with some 10 mW input ... Efficiency = ~ 70 %. And changing the value of the self from 10 uH to 100 uH does not really ...
• 14.6k
1 vote
Accepted

### Case to Ambient Resistance, D2PAK soldered to PCB

This was surprisingly difficult to find relevant information for, as most of the app notes I could find assume 4-layer boards with thermal vias. However, TI AN-2020 is a good starting point, and the ...
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### How can you measure voltage differences less than thermal voltage (~26mV at room temp)?

Thermal Voltage $$V_T=\frac{kT}{q}$$ and thermal noise voltage $$Vn_{rms}=\sqrt{4kTR\Delta f}$$ are not the same quantities. The symbol $k$ is used for Boltzmann's constant by SI. The ...
• 17k
1 vote

### How is junction-to-ambient temperature measured?

There are a bunch of assumptions, often not stated or hard to find. For example, with diodes they may make assumptions about lead length, copper pads and type of board. The loss down the leads can be ...
• 409k