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    Simple battery charger

    "Optimum" battery charging is far more complicated!!!! Each different chemistry will have it's own optimum charging profile with different charge rates to specific voltage levels, dwell times and float charge levels. Optimum charging is NEVER linear and can have multiple voltage level dwell times.
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    Glaringly obvious errors

    Looks like a PWM (around 59KHz??) motor speed controller, and you're trying to multiplex the half bridge driver? How big is the motor , and what's it going to do... ???
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    LM317 works Bad "SOS"

    I would disagree, at the die level there is 100% static and some dynamic testing done because it cost too much to finish processing the wafer using a bad "chip". Way back, when I worked as a design engineer at LTX (www.ltx.com), a manufacturer of mainframe semiconductor test equipment, part of...
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    Resistor wattage

    Sure, your MTBF would be affected running any component at it's limit. What determines a resistors wattage... like everything else, a certain temperature rise!!! As long as you can keep it "cool" your OK. Convection, while better than radiation, still isn't as good as conduction, for thermal...
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    Power Amp

    I've never seen an op-amp with an emitter follower configuration as an output stage, just a totem pole. Anyone have a part number for a op-amp with a emitter follower output stage??
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    Regulated power supply

    What are you trying to measure?? If you have an ammeter, why do need a shunt?
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    LM317 works Bad "SOS"

    The notice say's ... the diode is needed when the INPUT is shorted, not the output. While in die form, you can bet that each and every one is tested for sure!!!!!!!!
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    Saturable-Core Tranformer

    Do a google search on "mag amps"................
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    adjustable switching PSU 0-30v 0-5A

    Just a few general comments about the switching power supply…. The 100KHz 3842 design looks to be current mode forward converter. As such, by definition it doesn’t have current limit. It has power limiting… the output current will continue to increase as the output voltage collapses, thus...
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    0-30 Vdc Stabilized Power Supply

    Yeah, I'm sure C8 is used as a loop compensation cap (limit/control U3 output slew, but that's what feedback is all about), but that doesn't stop it from being a integrator, which IT IS!!!! I saw a post on another fourm that covered feedback in comparators circuits and why it is used!!!
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    Relays that stay ? is there such a thing?

    What you are talking about are called "latching relays". They have two coils, energize one and it flips one way, energize the other coil and it flips the other way. Also since they a latching, you don't have to have power applied to the coil all the time. I have only seen these as small, mercury...
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    0-30 Vdc Stabilized Power Supply

    U3 is "not really" used as a comparator, at least not in a "true sense". It is true, while the output current draw is below the current set point level, the output of U3 is sitting at the positive rail, but that's where the comparator similarity ends. It's configured as an integrator...
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