Circuits & Schematics: 10 - 3

21. Circuit offers series protection against power-line transients
    Alfredo Saab
    Circuits Supply Analog Devices MAX1614
    .. voltage, IC 1 includes an undervoltage-lockout feature that allows operation only when the line voltage is greater than 10 V. To protect against overvoltage, the circuit includes a three-transistor, no-bias-current, 50-nsec-operation ...
    Dec 1, 2025

22. A precision, voltage-compliant current source
    Christopher Paul
    Circuits Supply Texas Instruments TLA431 TLVH431B
    .. At the other extreme, under otherwise identical conditions, a V GS of 3.5 V will guarantee a drain current of less than 10 µA. For such, U 1 and the circuit as a whole will operate properly at a V S of 5 VDC. Higher temperatures might ...
    Nov 25, 2025
23. Protecting your prototype with automotive overvoltage protection
    Simon Bramble
    Circuits Supply Analog Devices MAX16126
    .. 2 is used: (2) Equating the previous equations gives Equation 3: (3) So (4) From this, (5) Using preferred values, let R3 = 10 kΩ and R2 = 180 kΩ. This gives an upper limit of 29 V and a lower limit of 5.09 V. This is perfect for a ...
    Nov 21, 2025
24. 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
25. 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
26. 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
27. 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
28. 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
29. 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
30. 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

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