Self-heated transistors used as thermal air flow sensors are a particular (obsessive?) interest of mine, and over the years I must have designed dozens of variations on this theme. Figure 1 illustrates one such topology seen here (Reference 1) ...
.. inverts its input voltage and doubles the resulting negative output. Figure 1. This switched-capacitor inverter derives 10 V from 5 V. Normally, the MAX889T voltage inverter, IC 1 , converts a positive input to a negative output voltage ...
.. 1. LM337 joins forces with 4053 CMOS switch to make a macho PWM DAC. Metal gate CMOS SPDT switches U1a and U1b accept a 10-kHz PWM 5v signal to generate a +1.25 V to 8.75 V “ADJ” control signal for the U2 regulator. ADJ = +1.25 ...
.. that produce equal voltage outputs of opposite polarity, are even more so. Figure 1’s version of a symmetrical 0 V to 10 V, 1.5 A lab supply implements an extra handy trick: computer programming via a single PWM output. Figure 1. LM337 , ...
I recently published a simple design ( Ref. 1 ) for a platinum resistance detector (PRTD) 4 to 20 mA transmitter circuit, illustrated in Figure 1. Figure 1. The PRTD 4 to 20 mA loop transmitter with constant current PRTD excitation that relies on ...
.. are the reference voltage at the feedback (FB) pin multiplied by 1 + R F /R G . Recommended values of C F from 100 pF to 10 nF increase the amount of feedback at higher frequencies, or at least ensure it is not reduced by stray capacitances ...
.. time sources, such as oven controlled crystal oscillators (OCXO) [2] which offer an annual stability of 2×10 8 , or a cesium standard [ 3 ] with an even higher typical stability of 3×10 12 . Unfortunately, upgrading an ...
.. input LTC6910-1, IC 1 , provides digital gain control from 1 to 100 using a 3-bit digital input to select gains of 1, 2, 5, 10, 20, 50, and 100. The circuit's lower 3-dB frequency is fixed and set to 1 Hz. A second LTC6910-1, IC 3 , is ...
.. head unit I attached a 1 inch iron floor flange centered 7 1/2 inches back from the generator end of the 2X4, and screwed a 10 inch long iron pipe nipple into it. The nipple would slip into the top of the piece of conduit I'd use as a tower and ...
.. larger than the actual load current. Though several inductor-based converters offer maximum quiescent current of less than 10 µA, designers usually prefer or require a regulated charge pump for cost-sensitive designs that must be ...