Circuits & Schematics: power supply - 8

71. DIY Low Frequency Generator - Op-Amp Tester
    Валерий Бабанин
    Circuits Oscillators Measurement Amplifiers GL5506
    .. to adjust the amplitude with resistor R13 to avoid clipping. The oscillator is powered by an unstabilized 6-16 V source. Power supply symmetry is ensured by the “active ground” circuit (Figure 5). Figure 5. An active earth ...
    Nov 20, 2024

72. RS-232 meets voltage-to-frequency converter
    Stephen Woodward
    Circuits Measurement Interfaces Texas Instruments CD4053B
    .. Recently, this “vintage” standard has been largely replaced (after all, it is 64 years old) by faster and more power thrifty serial interface technologies such as USB, I 2 C, SPI. Nevertheless, RS-232 hardware is still widely ...
    .. bipolar signaling levels remain robustly noise and cable-length-effects resistant. Another useful feature is the bipolar supply voltages (usually 6 V) generated by typical RS-232 adaptors. These can be conveniently tapped into via ...
    Nov 19, 2024

73. A fully analog electronic dice
    Patrick Van Torre
    Circuits Analogue Design Games Texas Instruments LM324 TLV2374
    .. would also light while the oscillator is running. We prefer the LEDs to light only when S1 is pushed, and therefore supply power to IC2 only in that case. This happens via T1 and R24. However, when IC2 is not powered, we should limit the ...
    .. this charge pump. Leftmost, a relaxation oscillator is formed around IC1A. This is a classic circuit, modified for a single supply voltage, setting the bias halfway that of the supply voltage with voltage divider R3 and R8. The oscillation ...
    Nov 15, 2024
74. DIY Soldering Station Analog Controller
    Валерий Бабанин
    Circuits Automation Measurement Supply Texas Instruments LM393
    .. of 2 C in the range from 150 to 450 C. The control characteristic of the potentiometer R2 must be linear. The rated power dissipation of the resistor R4 is at least 0.25 W. The circuit is operable in a wide range of supply voltages, ...
    .. and amounts to 60 s. If desired, it is easy to check by connecting the upper Rt pin according to the scheme to the positive supply rail. The stronger the heating, the earlier the circuit turns it off, while maintaining the set tip ...
    Nov 15, 2024
75. Half & Half piezo drive algorithm tames overshoot and ringing
    Stephen Woodward
    Circuits Automation Analogue Design Texas Instruments CD4066B CD74HC4538 TLV7042
    .. keeper for a suitable piezo drive amplifier to translate from the 5-V logic of the H H circuitry to piezo drive voltage and power levels. Materials on the topic Datasheet Texas Instruments CD4066B Datasheet Texas Instruments CD74HC4538 ...
    Nov 12, 2024
76. Simple circuit tests twisted-pair cables
    Mark D Braunstein
    Circuits Measurement Supply Fairchild LM317T
    .. a heat sink to the IC 1 regulator as a safety precaution, but normal tester operation is well within the regulator’s power-dissipation limits. Even with many shorted pairs, a dissipa­tion of 700 mW would cause no more than 60 C ...
    .. quickly check a cable of twisted-pair wires for short circuits, open circuits, and pair-to-pair shorts. A battery or a dc supply delivers 15 to 24 V to the test set. The voltage regulator (IC 1 ) is connected as a current regulator to ...
    Nov 11, 2024
77. Precise photovoltaic I-V characterization
    Aaron Schultz Catherine Chang Henry Surtihadi
    Circuits Measurement Analog Devices LTC2058
    .. last about 20 years, but thermal stress and moisture ingress, among other causes, can degrade a module’s output power over time. For the purpose of debugging, a module’s performance degradation can be measured by changes in ...
    .. down the full voltage of the module so that the output at V PV , after a closed-loop gain of 5 V/V, is within the 5 V supply rail. R1 and R2 can be adjusted to divide down any module open-circuit voltage (V OC ), as long as they do ...
    Nov 6, 2024
78. 80 MHz VFC with prescaler and preaccumulator
    Stephen Woodward
    Circuits Measurement Analog Devices LT1027
    .. Idea: “Take-back-half precision diode charge pump” ( Reference 2 ). It also gets help from AC logic family power-thrifty speed that was brand new and just becoming available in 1986. Jim used logic technology that was more ...
    Oct 28, 2024
79. To press on or hold off? This does both
    Nick Cornford
    Circuits Analogue Design Supply Texas Instruments CD4060B
    .. imagine that you need to add a power switch to something that’s battery-powered but processor-free; perhaps it must also be waterproof and ...
    .. anywhere from 3 to 20 V (or more, if Q1 is suitably rated), individual parts or functions may not. Typical values are: Supply R2 R4 3 V 0R 100k 6 V 0R 330k 12 V 100k 680k 20 V 300k 1M0 R2 ensures that Q1’s gate-source voltage is ...
    Oct 16, 2024
80. CMOS gate makes long-duration timers using RC components
    Raju Baddi
    Circuits Oscillators Texas Instruments CD4011B
    .. and ensures that Q 3 is biased off, which allows Q 1 and Q 2 to slowly charge C 1 through the constant-current action. The power-supply current draw of the gate increases somewhat as its input voltage pulls away from the 5 V rail. When the ...
    Oct 15, 2024

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