3843 smps circuit

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Use the form below to delete this Exploring 320voltcom Images Crazy Gallery image from our index. It's been some four years since the first set of circuits, long time for another installment. A pretty typical differential amplifier and emitter follower (in this case, quasi-complementary) output stage.
Using a complementary-differential input stage, this circuit ensures a 1.2V offset at the output.
This circuit consists of a small high voltage inverter, current-limited linear regulator and edge triggered avalanche breakdown pulse generator.
These two related cicruits are the result of contemplating a current-mirror-loaded differential amplifier with symmetrical loading and outputs.

A roughly constant voltage is developed across the transformer, so long as it's not loaded so heavily as to induce current limiting. A representative diagram of two op-amp-stabilized MOSFET current sinks (if Vout is grounded and Vin is the current output terminal). Two edge-triggered one-shot 555 timers wired in series, so the LED lights for a certain duration only a certain time after the switch is closed.
In the above circuit, forward bias (about 1A) was provided by a 15 ohm, 20W power resistor. This circuit forwards the rising edge and inverts the falling edge of the input square wave, thus doubling its apparent frequency. A typical function generator circuit, this consists of a current mirror (the top mirror sends double current to the bottom mirror), JFET follower, differential hysteretic comparator and an output buffer.
This circuit accepts input from an off-the-shelf ATX style computer power supply and regulates it down to a regulated voltage or current, suitable e.g.
An improved version, this circuit does not require an isolated 12V supply and is simpler in design. The challenge was, how to light two LEDs, only one or the other at any given time, using just resistors and a switch. A MOSFET switch connects a charged (open) transmission line to the output, thus sending a square pulse of half the peak voltage and length corresponding to the electrical length of the delay line. This circuit operates by using pulses to switch a flip-flop into one state or the other; as such, it can be used from DC to approximately 4MHz.
When driving a MOSFET where high bandwidth and linearity are necessary, this class A, constant-current-biased, complementary emitter follower driver circuit could be used.

Common-emitter gain stage followed by emitter follower, this amplifier suffers from low PSRR.
Thanks to the high bias current and overall simplicity (only five transistors and two diodes in the functional loop), this triangle wave generator is able to run very fast. This logic output stage is simple and reasonably effective, having lower offset voltage than an unbiased complementary emitter follower. These three circuits are in a series concerning my development of a (possibly world's first?) class D tube amplifier. Comparing the first two to the last, it was found that a gain stage and cathode follower were necessary to develop sufficient voltage and drive current to "switch" the 38HE7. Although sweep tetrodes offer extremely good performance in saturation voltage and peak current, if plate voltage drops too low, screen current goes up astronomically (easily 200mA+!).
Examples of biasing a tube for constant current draw using the traditional op-amp-and-follower current mirror circuit.
Examples in a series of possible developments incorporating a MOSFET follower into the μ-stage. EL519), very low primary impedances are necessary (~600 ohms), making these OPTs somewhat easier to wind.

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