Circuits & Schematics: 10

1. Designing 1 kW sine wave inverter circuit
   R. V. Dhekale
   Circuits Supply Power Texas Instruments CD4047B
   .. 1 W R5, R6, R8, R9, R11 1 kΩ R12 2.2 kΩ R7 220 Ω R10 5.6 kΩ VR1 470 kΩ preset VR2-VR4 10 kΩ preset Capacitors C1 0.2 µF, 100 V ceramic disk C2, C3 100 µF, 35 V electrolytic C4 1000 ...
   Jun 18, 2025

2. A two-way Wilson current mirror
   Stephen Woodward
   Circuits Analogue Design Texas Instruments LMC555
   Recently (5/21/25), I published a Design Idea (DI) describing a bidirectional current mirror using just two transistors and a diode, “A two-way mirror current mirror that is” ( Ref. 1 ). That circuit works well in some applications, ...
   Jun 12, 2025

3. Power amplifiers that oscillate - deliberately. Part 2 - A crafty conclusion
   Nick Cornford
   Circuits Analogue Design Audio Oscillators Microchip MCP6002 MCP6022
   .. loop somewhat under-damped at low frequencies, but are a good compromise. The spectra with unloaded outputs at 0 dBV and 10 dBV are both shown in Figure 2. Figure 2. The spectra for 1 kHz outputs at 0 dBV and 10 dBV, showing THDs of around ...
   Jun 12, 2025
4. Power amplifiers that oscillate - deliberately. Part 1 - A simple start
   Nick Cornford
   Circuits Analogue Design Audio Oscillators NXP TDA7052A TDA7056A TDA7056B
   .. that to 12 V made only one change to the performance: the output became very, very loud. And it drew around an amp with a 10 Ω load. And it could do with a heatsink. And a TDA7056A/B rather than a ’52. The Vcon input on pin 4 is not ...
   Jun 12, 2025
5. Simple, low-voltage charge-pumps. Part 2 - Alternatives
   Rod Elliott
   Circuits Beginners Supply Microchip TC7660 TC7660S
   .. most critical, as that determines the ripple on the output voltage. Using 100 uF, you can expect fairly low ripple with a 10 mA load. More than around 220 uF is unlikely to provide much benefit. Expect less than 1.5 mV (3 mV for the inverting ...
   Jun 12, 2025
6. Simple, low-voltage charge-pumps. Part 1 - Operating principle
   Rod Elliott
   Circuits Beginners Supply Microchip TC7660 TC7660S
   .. little, and ripple is increased. 100 uF is a good 'general purpose' value, but if the required current is less than 10 mA, the caps can be reduced. I don't recommend anything less than 33 uF though, because the 555 timer doesn't ...
   Jun 12, 2025
7. A two-wire temperature transmitter using an RTD sensor
   Jayapal Ramalingam
   Circuits Analogue Design Measurement Texas Instruments INA122 LM334 XTR116U CD40106B
   Designing an analog circuit can be a frustrating experience, as noted by Nick Cornford in his Design Idea (DI), “DIY RTD for a DMM” ( Ref. 1 ). With a fortnight’s struggle, I completed the design of 4 mA to 20 mA, two-wire ...
   Jun 11, 2025
8. Solar power MPPT control Li-ion battery charger
   Manoj Kumar
   Circuits Supply Solar Consonance CN3165
   .. Automatic low-power sleep mode when input supply voltage is removed Status Indication for LEDs or µP Interface C/10 charge termination Automatic recharge Battery temperature sensing Circuit diagram I have read the datasheet, and it ...
   Jun 4, 2025
9. Revisited: Three discretes suffice to interface PWM to switching regulators
   Stephen Woodward
   Circuits Supply Microcontrollers Usage Texas Instruments TPS62933
   .. required for 1 lsb (0.4%) PWM ripple attenuation is where N is number of PWM bits, and F PWM is the PWM frequency (10 kHz illustrated). Then, to avoid messing with U1’s designed loop gain, possibly reducing stability, This ...
   Jun 2, 2025
10. Precision programmable current sink
    Stephen Woodward
    Circuits Analogue Design Supply Diodes TL431
    .. PWM with I S = D/R1 where D equals the 0 to 1 (0% to 100%) PWM duty factor: as D = 0 to 1 The 8-bit PWM resolution and 10-kHz frequency are assumed. The R2C1 single-pole ripple filter has a time constant of approximately 64x the PWM period ...
    May 22, 2025

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