modified 11 years ago

2 Opamp lamp circuit

00:49:15

You can change potantiometer to set the dc output voltage.

published 11 years ago

Sine_eyed

11 years ago

Did I miss something? I don't see them amplifying, there isn't any external input, they're not comparing- why use op-amps?..

rbrtkurtz

11 years ago

It's not doing anything at all. Since you already have 15VDC for the op amps Vss, just use that with your potentiometer and bulb. It's not difficult to build a serial linear regulator with an op amp and a BJT. You might look into that.

Sine_eyed

11 years ago

Is that what this supposed to be @rk?..

rbrtkurtz

11 years ago

Your guess is as good as mine. It looks like the intent is AC in -> Adjustable DC out. You can easily do that with a rectifier and regulator. Decent low-power serial linear regulators are easy to make with an op amp, BJT, one zener diode, and a handful of resistors. You'll need a transformer, a few diodes, and at least one cap to get from AC to DC first. Still, about a dozen common parts, and you've got something tangible; something worth making, and keeping around.

kycn

11 years ago

I will try yours guesses thanx. But i want to ask one question. How can use a bjt transistor for build low ripple ac dc rectifier?

rbrtkurtz

11 years ago

I just posted a circuit titled "Serial Linear Regulator" as an example.

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