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I will second the general reliability of the Metcal irons, as well as the availability of many different tips for SMD packages, but they are expensive. Back in the day we usually used Weller workstations (they were more affordable), and they never broke. They might have been TCPN's, but I...
Re: current limiter for 48v supply ( 50ma )
Polyfuse will reset by removing the power. Once it cools off it will reset. But it will not simply reset itself when the current drops below the trigger threshold - it will remain in a high resistance state until the power is removed and it cools down.
The capacitor will draw no current, as it will charge immediately to the potential of the DC source. The DC source is ideal, and can provide infinite current to the capacitor, so the capacitor will draw no current (i.e. fully charged at time 0). Thus, the only current path is through the...
The pmos devices will cut the flow of current to the inverters, but this does not allow the outputs to pull low. If you want the output to be 0 volts you will need an nmos shunt device on the outputs. When enable is high, the pmos devices will cut the current flow to the inverters, and the...
If I understood your post correctly, this has gone from a Thevenin equivalent question to an algebra question. To solve for R1 and R2, let's express them as some multiple of R (i.e. R1 = 5R and R2 = 7R), which is a kind of restatement of (1), but putting the unknown as a multiple of R. So...
You're doing it wrong. The Thevenin equivalent is the Thevenin voltage in series with the Thevenin resistance. The thevenin resistance in this case is R1 in parallel with R2. If a resistance R3 is connected between the "Thevenin" node and ground (i.e. in parallel with R2), you can find the...
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