Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 6

51. Black Light
    Circuits Supply Light Power
    .. R1 470 Ohm Resistor R2 270 Ohm Resistor T1 Medium Yellow Inverter Transformer MISC IC Socket, Heat Sink For Q1, Screw, Nut, Wire and PC Board Notes: P1 changes brightness of the black light tube. elecircuit.com
    .. circuit is a simple ultraviolate light that can be powered by a 6 volt battery or power supply that is capable of supplying 1 or more amps. Circuit diagram Parts C1 0.0047uf Mono ...
    Dec 27, 2010

52. Isolated-FET Pulse Driver Reduces Size, Power Consumption
    Jaime Castelló José María Espí Rafael García-Gil
    Circuits Power APT APT40GF120JRD
    .. 20-turn primary winding and a 12-turn secondary winding, both fabricated from 0.2-mm-diameter, 0.008-in, AWG #32 magnet wire. When transistor Q 1 switches on, it induces a positive voltage in T 1 ’s secondary winding that switches ...
    .. resets through R 3 and D 3 . The voltage at T 1 ’s secondary winding goes slightly negative to balance the core's volt-second characteristic, which forward-biases Q 3 ’s body diode without current, and Q 4 ’s body diode ...
    Mar 30, 2022
53. Wireless Power Demo Circuit
    Circuits Power
    .. have been asking me for the circuit of the demonstration TX I used in the video, so here it is: This is *not* an efficient design and is meant as a demonstration only. The compression trimmer should be fairly high quality, but as the demo ...
    Nov 11, 2011
54. A diode ladder multiplies voltage under software control
    William Grill
    Circuits Supply Microcontrollers Usage Power
    .. eight-pin micro multiplies, monitors, and delivers a boosted voltage to a load The circuit in this Design Idea uses a Microchip PIC12F510 controller to drive a voltage multiplier ladder and a single pin to output ...
    Mar 30, 2012
55. Induction Receiver
    Circuits Wireless Texas Instruments TL431
    .. (as in a relay or transformer) unless you can remove the iron. The resulting coil should be a simple solenoid like wire wrapped around a nail. Don't try to wind your own it takes too many turns. Evaluate several coils simply by ...
    .. coil if available or a suitable coil from some other device. The coil in the prototype was salvaged from a surplus 24 volt relay. Actually, two relays were needed since the first was destroyed in the attempt to remove the surrounding ...
    May 9, 2017
56. DIY Low Frequency Generator - Op-Amp Tester
    Валерий Бабанин
    Circuits Oscillators Measurement Amplifiers GL5506
    .. A homemade optocoupler (Figure 4) with a GL5506 photoresistor (peak spectral sensitivity is 540 nm) and a green SMD LED (510-555 nm) of 3014 footprint (3.0 mm × 1.4 mm) is used. Such a pair effectively performs its function at 100 ...
    .. Yellow and white LEDs have been successfully tested. Don't forget to shade the optocoupler in bright light. Figure 4. Design of a homemade optocoupler. The filter capacitor C3 can be omitted when working with frequencies above 1 kHz; ...
    Nov 20, 2024
57. A nice, simple, and reasonably accurate PWM-driven 16-bit DAC
    Christopher Paul
    Circuits Measurement Microcontrollers Usage Texas Instruments OPA383 REF35 SN74AC04 TS5A22362
    .. Replacing the R A 0.1% part with a 0.05% part Replacing the 30.1 kΩ R B2 with a 28.7 kΩ 1% resistor in series with a 5% 510-Ω unit. Driver power supply Alas, once again, we must abandon the goal of keeping the errors introduced to less ...
    .. maximum over the temperature range. The bias current is 76 pA maximum from 40 C to +85 C. I’d like to keep the design’s various independent error contributions under ½ PWM count (in this case, under 2 -17 of ...
    Aug 11, 2025
58. Simple RC Cars - Single channel Transmitters and Super Regenerative Receivers at 27 MHz and 49 MHz
    Circuits RC Modeling
    .. is the 9 volt GS transmitter which does not use a crystal. This clever design allows only two transistors to generate both the ...
    Mar 8, 2005
59. Neon Desklamp
    Circuits Domestic Light
    .. This circuit will power a 6 inch 4 Watt fluorescent tube off a 12 Volt supply, consuming 300 mA. It may also be powered by a suitably rated universal AC/DC adapter. Advantages of the ...
    Nov 5, 2008
60. Short Range Hand Wave Detector
    Circuits Domestic LMC7211 LM358
    .. FET, which can turn on a beeper or activate a relay. If a low power voltage comparator is used, such as the LMC7211 , a 9 volt battery will power the circuit for many years. The more popular LM358 would also work but would draw more ...
    .. David Johnson P.E. Challenge: Design a battery powered circuit, which can turn something on or off, with the wave of a hand over a surface. ...
    Mar 31, 2009

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