Circuits & Schematics: Volt - 4

31. Forced Quenching Improves Three-Transistor FM Tuner
    Lyle Williams
    Circuits Radio NXP BF245
    .. then remove one of them. When formed, the coil can be removed from the form. The coil is tapped one half turn from the 9 volt supply side to make a connection for the antenna. A one meter long wire antenna is sufficient. The 0.04 to 6 pF ...
    Oct 18, 2016

32. Monitor Transformer Winding's Temperature Without A Sensor
    Louis Vlemincq
    Circuits Analogue Design Measurement
    .. If the gain is made such that the cold output has a certain value (0 V, for example), then each additional volt will correspond to a definite temperature rise (34 C in this example). The gain and injection components can be ...
    Sep 2, 2016

33. Linear ramp generator uses one op-amp
    Circuits Analogue Design Oscillators
    .. follower, with D1 D2 clamping the input to one diode drop above or below the output. When the input step-changes by a volt or more, the diodes will keep the voltage across R2 at a nearly constant 0.3 V (because the output will follow ...
    Nov 11, 2015
34. Schmitt trigger uses two transistors
    Circuits Analogue Design
    .. term depends on the gain of Q 2 , the measured voltage is usually somewhat different, but is typically in the 2 to 3 volt range. The current in RIN also adds into the voltage on R 2 (Eq. 9), and if R 1 is too small, the current will ...
    Sep 24, 2015
35. Microcontroller Solves Complex Temperature Polynomial Equations
    Ricardo Jimenez Roberto Solorio
    Circuits Microcontrollers Usage Theory LM103 PIC16F887
    .. a sampling time of 50 µs. The thermistor’s voltage reading is stored in binary format in the variable “ volt ” with the instruction ADCIN 0, volt . Then, this reading is multiplied by 48,828 to convert it to decimal, ...
    May 20, 2015
36. High Power RGB LED Color Mixing
    Circuits Light Power CAT4101
    .. utilizing 1 amp maximum constant current drivers that are adjustable with trimmer potentiometers and powered from a 5 volt DC supply. Figure 1. Constant current drive circuit. With a 500 millivolt minimum above VF of the LED die, this ...
    Mar 18, 2015
37. 12 Volt Off-line Buck Regulator on NCP107x
    Circuits Supply Power Application Notes ON Semiconductor NCP1071 NCP1075 NCP1077
    .. max rated load. Below 1% the output will rise to the value of the overvoltage clamping zener Z2 across the output. For a 12 volt output, a typical value for this zener will be 15 volts and at no load, the output will be clamped at this level. ...
    Jan 2, 2014
38. Robot shield for Arduino. Part 3 - Analysis of the firmware, functions that are common to all the robots
    Circuits MCU Open-Source Platforms Microcontrollers Usage Robots Arduino
    .. LiPo or six if you use NiMh or NiCd cells, eight cells used instead if you can increase this value up to 8.0 volts or, one volt per used cell. Another common procedure is called to all the robots initServo () to initialize the servos: Code 3 ...
    Nov 19, 2012
39. Robot shield for Arduino. Part 1 - Hardware and Schematic
    Circuits MCU Open-Source Platforms Microcontrollers Usage Robots Arduino
    The idea behind this post is to bring together some robot designs and trasform them in a new device with new hardware and standard software (arduino of course) and so easier to use. These robots have three things in common: a mechanical structure, ...
    Oct 31, 2012
40. Arduino expansion board used for controlling large numbers of LEDs
    Circuits MCU Open-Source Platforms Light Arduino
    .. used to supply the additional current, but should NOT be directly connected to the header, as battery voltage varies. A 5 volt voltage regulator, if your battery outputs more than 5 volts, or a voltage stepper, if you battery outputs less ...
    Nov 1, 2011

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