Circuits & Schematics: power supply

1. Frequency division by any number, with a 50% duty cycle output
   Jayapal Ramalingam
   Circuits Digital Texas Instruments CD4040B CD4585B
   .. This circuit divides the input frequency by 10. The output is a 2.4 kHz square wave with a 50% duty cycle. The ICs’ power supply and ground pins are not shown. For division by other numbers, change the DIP switch (DSW1) setting: ...
   Sep 23, 2026

2. 3W stereo differential input class-D audio amplifier with UP/DOWN volume
   Mike (mixos)
   Circuits Audio Beginners Diodes PAM8408
   .. Solder jumpers J1 and J2 are optional and of no use, it is advisable to keep these jumpers open. Connector CN1 is for power supply, CN2 is for audio signal input, CN3, and CN4 are for the speaker, jumper J3 is for shutdown, D1 is the ...
   .. to control the UP/DOWN volume in 32-steps and it will hold the setting when the chip is in shutdown mode. The operating supply is 2.5 V to 6 V DC and this supply range helps to operate it with batteries like the use of 4 × ...
   Sep 22, 2026
3. Push-pull voltage mode PWM controller
   Mike (mixos)
   Circuits Beginners Supply Texas Instruments LM5033
   .. Frequency selection R5 16K = frequency 339 kHz R5 8.2K = frequency 600 kHz R5 26.7K = frequency 200 kHz Features Power supply 15 V to 30 V DC Maximum load 1 A (MOSFET 7 A) Operating frequency 339 kHz Thermal shutdown Over current ...
   Sep 16, 2026
4. Low noise 45V-4A dual rail power supply using enhanced capacitance multiplier
   Hesam Moshiri
   Circuits Supply STMicroelectronics BD139 BD140 TIP35C TIP36C
   .. core element of any electronic device is the power supply. Any instability or malfunction of the power supply causes the device to malfunction or demonstrate ...
   Sep 14, 2026
5. 78xx replacement (SD8942)
   Stefan Wagner
   Circuits Supply Shouding SD8942
   .. regulators with this much more efficient pin-compatible buck converter. Efficiency test. 7805 replacement. Input: 12 V. Max power: 11627 mW. Max efficiency: 93.2%. Efficiency test. 7805 original (L78S05CV). Input: 12 V. Max power: 7367 mW. ...
   Sep 10, 2026
6. Hot-swap switch provides easy thermal protection
   Donald Schelle
   Circuits Microcontrollers Usage Texas Instruments LM26 LM25069
   .. board). A hot-swap switch and carefully placed temperature sensors mitigate thermal issues by disconnecting system power when a temperature exceeds a safe limit. The circuit in Figure 1 uses a hot-swap switch to monitor overvoltage, ...
   Sep 9, 2026
7. An ultrasonic range finder using an SRF05 and an ATtiny85
   Hesam Moshiri
   Circuits Measurement Microcontrollers Usage Atmel ATtiny85
   .. schematic diagram of the ultrasonic range finder device. As it is clear, the circuit consists of four main parts: sensor, power supply, MCU, and display. I explain each part separately. Figure 1. Schematic diagram of the ultrasonic range ...
   Sep 7, 2026
8. Circuit compensates system offset of a load-cell-based balance
   Luca Bruno
   Circuits Measurement Microcontrollers Usage Analog Devices LT1461 LT1789 LTC1286
   .. a challenge to interface a resistive bridge sensor with an ADC receiving its power from a 5 V single-supply power source. Some applications require output-voltage swings from 0 V to a full-scale ...
   Sep 3, 2026
9. Wireless LED flasher
   David A. Johnson
   Circuits Wireless Supply Light Texas Instruments TLV3701 ТI SN74HC04
   .. can be powered from a supply ranging from 3 V to 6 V. It draws about 300 µA of average current at 5 V. It uses a low power op Amp as a pulse generator. A negative going pulse from that generator gates a power oscillator on for about ...
   Sep 2, 2026
10. Digital AC energy measurement circuit V2 RMS voltage, RMS current, real power, power factor, energy kWh
    Hesam Moshiri
    Circuits Measurement Supply Microcontrollers Usage STMicroelectronics STM32G030F6
    .. a phase shift between voltage and current and alter the sine-wave shape of the AC signal (resistive loads do not). The power factor of resistive loads is theoretically equal to 1. In this article, I introduce a circuit that can measure ...
    .. SW3, SW4 TS-1007S-AR02516 SMD T1 UU9.8-10 mH TH T2, T3 2N7002 SOT-23(TO-236) SMD U1 HLK-PM01 TH Figure 2 shows the power supply section of the circuit, isolated output and non-isolated. The power supply of the measurement part should be ...
    Aug 27, 2026

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