Circuits & Schematics: power supply - 4

31. 85VAC-260VAC to 12V-0.5A AC-to-DC flyback converter using an RM6 ferrite core
    Hesam Moshiri
    Circuits Supply Dongke Semiconductor DK106
    .. isolated AC-to-DC flyback converter is the most commonly used power supply type for home and industrial devices. Fear of the main voltage and complexity of calculations cause ...
    Nov 17, 2025

32. My 100-MHz VFC - the hardware version
    Jim McLucas
    Circuits Measurement Texas Instruments CD74HC14 SN74LVC1G14 74LVC1G74 TLA431 TLV9162
    .. the PCB, and then tested the design. Figure 1. VFC design that operates from 100 kHz to beyond 100 MHz with a single 5-V supply, providing square wave outputs at ½ and ¼ the main oscillator frequency. The hardware ...
    Nov 14, 2025
33. Low power ozone generator
    Joribo
    Circuits Medicine ON Semiconductor 1N4007 1N5408
    Generating ozone and negative ions in the air can be done by a corona discharge. For this we can use a sharp tip of negative polarity, acting against a flat metal part of positive or neutral potential. The device generates negative air ions and ...
    Nov 12, 2025
34. Stereo digital FM transmitter circuit
    Hesam Moshiri
    Circuits Microcontrollers Usage Radio KT Micro KT0803L
    .. It consists of several parts which I explain one by one. Figure 1. Schematic diagram of the digital FM transmitter project. Power supply P2 is an XH connector to apply power to the board. The input voltage could be something between 7-9 VDC. ...
    Nov 6, 2025
35. Programmable current source with overtemperature shutoff
    Stephen Woodward
    Circuits Supply Texas Instruments OPA186
    .. anti-overheating features. Some are very good, like “Improve the accuracy of programmable LM317 and LM337-based power sources” ( Ref. 1 ). Others perhaps not so much “Cross-connect complementary current sources to ...
    .. error” ( Ref. 2 ) All of them, however, had to accommodate the LM3x7 family’s need for about 5-V of supply voltage headroom when used this way. That is the voltage drawn from the supply that can never be delivered to ...
    Oct 28, 2025
36. Phantom powered microphone preamplifier - low noise - professional quality
    Rajkumar Sharma
    Circuits Analogue Design Audio Texas Instruments INA163 OPA2134
    .. low-distortion, monolithic instrumentation amplifier. R2 and R3 provide a current path for a conventional 48 V phantom power source for a remotely located microphone. A slide switch SW1 allows phantom power to be disabled. C6 and C8 ...
    .. Additional input protection against ESD and hot-plugging, four 1N4148 diodes D1, D2, D3, D4 connected from the input to supply lines. R7 and R8 provide a path for the input bias current of the INA163. Gain is set with a variable ...
    Oct 23, 2025
37. Power supply accepts wide input-voltage range
    Jim Windgassen
    Circuits Supply Analog Devices LT3008 LTC1871
    .. switching power supply in Figure 1 produces 3.3 V dc from an input voltage of 2.5 to 20 V dc with high efficiency. The circuit ...
    Oct 22, 2025
38. Voltage-to-period converter offers high linearity and fast operation
    Jordan Dimitrov
    Circuits Measurement Microcontrollers Usage Analog Devices AD650
    .. the transfer function is as follows: To start oscillations, the following relation must be satisfied when the circuit gets power: Figure 2 shows that the transfer function of the circuit is perfectly linear (the R² factor equals ...
    Oct 21, 2025
39. "Flip ON Flop OFF" for 48-VDC systems with high-side switching
    Jayapal Ramalingam
    Circuits Supply Texas Instruments CD4024B CD40106B
    .. to ICs U1 and U2. A precise setting is not important, as these ICs can operate from 3 to 15 V. R2 and C2 are for the power ON reset of U1. R1 and C1 are for the push button (PB) switch debounce. When you momentarily push PB once, the ...
    Oct 19, 2025
40. Amps x Volts = Watts
    Stephen Woodward
    Circuits Measurement Supply NXP 74HC4053
    .. among other conversions. Figure 1 joins the flock while singing a somewhat different tune. This current, voltage, and power (IVW) DC power converter multiplies current by voltage to sense wattage. Here’s how it gets off the ...
    Oct 19, 2025

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