Circuits & Schematics Diodes

1. Sweep generator with marker
   Cor van Rij
   Circuits Oscillators Measurement Diodes NE555
   This circuit is a simple sweep generator. The sawtooth is generated by the PNP transistor and the 555 . The transistor together with the 2 diodes at the base form a constant current source which charges the 330 nF capacitor. If 2/3V CC (=6 V) is ...
   Jan 7, 2025
2. ∆V_BE bread dough incubator
   Stephen Woodward
   Circuits Automation Analogue Design Measurement Diodes AP4310A
   I was surprised recently when a (nearly) two-decade-old design idea of mine for take-back-half temperature control ( Ref. 1 ) got a question from reader John Louis Waugaman. John says he needs a way to control the temperature of batches of rising ...
   Dec 10, 2024

3. Improved PRTD circuit is product of EDN DI teamwork
   Stephen Woodward
   Circuits Measurement Diodes AP4310A
   Recently I published a simple platinum resistance temperature detector (PRTD) design idea ( Reference 1 ) that was largely inspired by a deviously clever earlier DI by Nick Cornford ( Reference 2 ). Remarkable and consistently constructive critical ...
   Oct 10, 2024
4. Single phase mains cycle skipping controller sans harmonics
   Jayapal Ramalingam
   Circuits Supply Diodes NE555
   In electrical heating applications, resistive heaters are powered through phase angle-controlled SCR/triac circuits to vary the applied voltage/power to maintain the required temperature. Phase angle control produces a lot of harmonics leading to ...
   Apr 15, 2024
5. UVP protects rechargeable batteries
   Peter Demchenko
   Circuits Supply Diodes TL431
   Many rechargeable battery types can be damaged by deep discharge. This Design Idea circuit performs under-voltage protection (UVP) to prevent this, as well as acting as a load switch (Figure 1). With little or no modification, it can work for ...
   Nov 30, 2023
6. An efficient and simple regulator for heating/lighting purposes
   Peter Demchenko
   Circuits Supply Diodes TL431
   This switching regulator is highly efficient and can be used for AC and DC and requires no reactive L/C components. The regulator can provide a power factor very close to 1. The circuit (see Figure 1) can be used to regulate a heating process with ...
   Oct 5, 2023
7. Using a MOSFET as a thermostatic heater
   Peter Demchenko
   Circuits Automation Diodes TL431
   The MOSFET in Figure 1 is used as both a heater and a temperature sensor in a thermostatic circuit. Figure 1. Circuit diagram for using a MOSFET as a thermostatic heater. The circuit can be used as a tiny thermostat for some biological structures ...
   Mar 30, 2023
8. Circuit lets you measure zener voltages and test LEDs
   Vladimir Oleynik
   Circuits Measurement Diodes ZXLD381
   To measure a zener diode’s breakdown voltage, you need a dc voltage source whose voltage exceeds that of the zener voltage. In Figure 1, resistor R SER provides voltage drop between V IN and V ZEN . In any case, V IN should exceed V ZEN . ...
   Nov 30, 2022
9. Shunt circuit clips large transients or regulates voltage
   Peter Demchenko
   Circuits Supply Diodes TL431
   The circuit in Figure 1 is a high-power analog of the popular TL431 programmable shunt regulator. This two-terminal circuit is convenient when the drain of the P-channel FET is grounded, since it needs no isolation from a grounded heatsink. Figure ...
   Nov 24, 2022
10. Light-Sensing Circuit Yields Human-Like Dynamic Range
    Steven Hendrix
    Circuits Measurement Light Diodes ZLLS400
    The human eye is remarkably sensitive to changes in light level. In ambient light ranging over several orders of magnitude, the eye can detect changes of only a few percent, yielding an incredible dynamic range. The primary trick is that the ...
    May 25, 2021

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