Circuits & Schematics: metal - 10

91. Trick a BJT-based converter into starting at only 250 mV dc
    Circuits Supply Diodes ZTX1047 ZTX869
    .. generators, electro-osmotic cells, fuel cells, and low-yield electrochemical couples. You can stick a pair of dissimilar metal rods into the soil and get useful power. The circuit provides no regulation because a luxury of energy ...
    Oct 13, 2020

92. Reset generator uses «fleapower»
    Circuits Microcontrollers Usage Maxim MAX919
    .. choice, the circuit can generate periods from milliseconds to minutes. To ensure good temperature stability, you should use metal-film types for R 1 and R P and NP0 types for C 1 and C P . Assuming a reset-logic threshold of 30% of the ...
    Feb 25, 2021

93. Circuit for optical reflex sight adds automatic power-off
    Stephen Woodward
    Circuits Games Supply Texas Instruments CD4060B
    .. that disconnects the battery after an hour of inactivity. The timer function is based on the venerable (okay, ancient) metal-gate CMOS 4060B 14-bit oscillator/divider. The’60s input stages form a gated oscillator, in this case ...
    Mar 10, 2021
94. Input filter prevents instrumentation-amp RF-rectification errors
    Moshe Gerstenhaber
    Circuits Analogue Design Measurement Analog Devices AD627 AD8221
    .. a ground plane on both sides. All component leads should be as short as possible. Resistors R 1 and R 2 can be common 1% metal-film units. However, all three capacitors need to be reasonably high-Q, low-loss components. Capacitors C 1A ...
    Apr 4, 2021
95. Digitize Thermocouple Output Near Sensing Point
    Circuits Measurement Maxim MAX6674 MAX6675
    .. cost-effective, widely available, and suitable for a wide range of temperatures. It consists of two wires of different metal or metal alloys, welded together at the sensing end (usually called the hot junction). The thermocouple output ...
    Apr 7, 2021
96. IC maintains uniform bias for GaAs MESFETs
    Ken Yang
    Circuits Analogue Design Maxim MAX4473
    .. gate-turn-on threshold voltage for GaAs MESFETs (gallium-arsenide metal-semiconductor field-effect transistors) varies considerably from part to part, even within a given lot. That ...
    Apr 13, 2021
97. Portable Power Inverter Circuit
    T.K. Hareendran
    Circuits Supply Texas Instruments CD4047
    .. the T5-T6 MOSFETs. Because the inverter has fatal mains voltages present, it is highly recommended that it be put into a metal enclosure (with adequate vent holes). The largest component is the toroidal transformer, which should be ...
    Jul 19, 2021
98. A simple and fully automatic, 12V uninterruptible power supply system for small/medium power appliances
    Circuits Supply Microchip PIC16F688
    .. of the PCB are 131.7 mm × 100 mm. Figure 4. 12 V Uninterruptible Power Supply System Test setup. Use 1% 0.25 W metal film resistors for R3, R7, and R8 to get accurate results. For R2 and R4, use 3 W or higher rated ceramic ...
    Jul 22, 2021
99. Calibrated Noise Test Setup Increases Measurement Repeatability
    Roger Griswold
    Circuits Measurement
    .. adequate drive for the analyzer’s 50-Ω input. It was chosen for its low noise and high output drive. A grounded metal cage encloses and shields the entire circuit against electromagnetic interference (EMI). The reference points ...
    Aug 11, 2021
100. Fast Load Transient Tester Circuit Features Adjustable Slew Rate
     Chester Simpson
     Circuits Measurement Supply Texas Instruments LM555 LP38501-ADJ
     .. while R2 and R6 are standard linear potentiometers. Load resistor R10 must be non-inductive, preferably carbon film or metal oxide. Sense resistor R11 also must be non-inductive. Metal film is recommended. All capacitors are ceramic, ...
     Dec 24, 2021

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