.. I expect it to operate at the lower frequencies at least as well as Woodward’s circuits. Operation down to 1 Hz or 10 Hz is, in my opinion, mostly for bragging rights, and I am not concerned about that. I expect this VFC to be useful ...
We’ve seen lots of interesting conversations and Design Idea (DI) collaboration devising circuits for power switching using inexpensive (and cute!) momentary-contact SPST pushbuttons. A recent and interesting extension of this theme by ...
.. NPO/COG capacitors and the resistors of the values and tolerances shown in the schematic are available for well under $0.10 in 1000-piece quantities. The filter shown is a 3 rd -order one (evident from the presence of three capacitors). ...
.. instantaneous 60-Hz half-wave polarity. The type H11D1 300-V opto has a typical current transfer ratio of 80% which makes ~10 mA of PWM drive current necessary. Current limiter R2’s 330 Ω assumes a 5-V rail and a low impedance driver. ...
.. 1a's circuit without using additional compensation circuitry (Figure 2). For a 2400 bps serial link with less than 10% error on the bit length, the rise-time estimate is 42 µsec, which corresponds to a 7.5-kilohms resistor. ...
.. to drift from 1.25 V to 1.2375 V, causing the output current to decline by about 1% of full scale. This 1% corresponds to 10 mA out of 1000 mA and is somewhat less than 3 LSB of an 8-bit setting. That’s perhaps not great, but it’s ...
.. regulator chips. This scheme makes power-capable DACs with double-digit wattage outputs. For example, “0 V to -10 V, 1.5 A LM337 PWM power DAC” ( Ref. 1 ). The simple circuit in Figure 1 joins this favored family but makes ...
.. discharge C 1 to ground. Its “on” resistance is less than 1 Ω and so yields a discharge that lasts more than 10 time constants. The sawtooth’s peak amplitude A is where V REF for U 1 is 1.225 V. For a 3.3-V rail, the ...
.. by adding one resistor (R8) and changing another (R1). Here’s the scale-changing arithmetic: For example, 10 V is illustrated in Figure 4. Figure 4. A 10-V V IN span is easily accommodated if you can find a 15 MΩ precision ...