Circuits & Schematics: 10 - 2

11. 85VAC-260VAC to 12V-0.5A AC-to-DC flyback converter using an RM6 ferrite core
    Hesam Moshiri
    Circuits Supply Dongke Semiconductor DK106
    The 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 electronic beginners and enthusiasts to procrastinate DIY such ...
    Nov 17, 2025

12. My 100-MHz VFC - the hardware version
    Jim McLucas
    Circuits Measurement Texas Instruments CD74HC14 SN74LVC1G14 74LVC1G74 TLA431 TLV9162
    .. the oscillator signal? To deal with this problem, I used a battery supply, four alkaline batteries in series, connected to a 10-turn, 100-kΩ potentiometer to drive the input of the circuit with about 0 to 6 V. This worked quite well. I added a ...
    Nov 14, 2025

13. Stereo digital FM transmitter circuit
    Hesam Moshiri
    Circuits Microcontrollers Usage Radio KT Micro KT0803L
    Without a doubt, FM transmitter and receiver are among the top favorite electronic project topics, however, building a digital FM transmitter can be a challenging project for electronics enthusiasts. The transmitter can then be connected to a ...
    Nov 6, 2025
14. Programmable current source with overtemperature shutoff
    Stephen Woodward
    Circuits Supply Texas Instruments OPA186
    Recently, we’ve seen Design Ideas for programmable current sources with improved accuracy using the LM3x7 series of three-legged regulators. These designs also take advantage of those classic devices’ built-in anti-overheating features. ...
    Oct 28, 2025
15. Phantom powered microphone preamplifier - low noise - professional quality
    Rajkumar Sharma
    Circuits Analogue Design Audio Texas Instruments INA163 OPA2134
    The project presented here is a professional quality phantom powered microphone pre-amplifier (Figure 1). The project is built using the INA163 chip from TI. The Chip is a very low-noise, low-distortion, monolithic instrumentation amplifier. R2 and ...
    Oct 23, 2025
16. Voltage-to-period converter offers high linearity and fast operation
    Jordan Dimitrov
    Circuits Measurement Microcontrollers Usage Analog Devices AD650
    .. numbers is from 200 to 4800, i.e., the resolution is 1 count per mV. Resolution can be easily increased by a factor of 10 by setting the clock frequency to 10 MHz. The great thing is that the nonlinearity error and conversion time remain ...
    Oct 21, 2025
17. Amps x Volts = Watts
    Stephen Woodward
    Circuits Measurement Supply NXP 74HC4053
    .. 60-dB of ripple attenuation for V LOAD 1-V and a low noise 0- to 5-V output suitable for consumption by a typical 8- to 10-bit resolution ADC input. Diode D1 provides fire insurance for U1 in case V LOAD gets shorted to ground. Reference ...
    Oct 19, 2025
18. A digital frequency detector
    Ariel Benvenuto
    Circuits Signal Processing, Filters Digital Texas Instruments SN74AC10 SN74HC74
    .. IC4A out of that state will be by applying a low level (could be a very narrow pulse, as in this case) at its /S input (pin 10 of IC4). That would establish a forbidden condition for an instant, making IC4A first pull high both Q and /Q, and ...
    Oct 14, 2025
19. Dropping a PRTD into a thermistor slot - impossible?
    Nick Cornford
    Circuits Measurement Vishay NTCLE100E3
    .. 257.58 258 -25.0 90.19234 0.95420 243.32 243 0xF3 -20.0 92.15990 0.89829 229.06 229 -15.0 94.12439 0.84238 214.81 215 -10.0 96.08588 0.78647 200.55 201 -5.0 98.04440 0.73057 186.30 186 0.0 100.00000 0.67466 172.04 172 0xAC 5.0 101.95271 ...
    Oct 13, 2025
20. Drive any electronic clock with a high-precision 10-MHz reference
    Gavin Watkins
    Circuits Oscillators Beginners Digital Texas Instruments SN74HC00 SN74HC390
    .. time sources, such as oven controlled crystal oscillators (OCXO) [2] which offer an annual stability of 2×10 8 , or a cesium standard [ 3 ] with an even higher typical stability of 3×10 12 . Unfortunately, upgrading an ...
    Oct 7, 2025

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