12AV6 Vacuum Tube Radio with LM386 Power Amplifier Lewis Loflin 2026-09-19 | 12AV6 Vacuum Tube Radio with LM386 Power Amplifier
Hall Sensor Magnetic Bias Detects Ferrous Metals, Gears Lewis Loflin 2022-07-08 | How industrial Hall Sensors detect ferrous metals using magnetic biasing.bristolwatch.com/hall_effect/mag_hall.htm
Exploring Omni Hall Effect Sensors with Dual Outputs Lewis Loflin 2022-07-08 | This sensor has dual Schmitt triggers and dual outputs. A switch that works on both magnetic polarities.bristolwatch.com/hall_effect/omni_hall_effect.htm
Hall Effect Latches Theory and Circuits Pt. 3 Lewis Loflin 2022-07-05 | Continuing our study of Hall Effect Devices. See the previous two videos:Basics of Hall Effect Analog Sensors & Switches Pt. 1youtu.be/ykG4ezJLuZ8Operate, Build Hall Effect Switch Pt. 2youtu.be/qoLJU1pAVeUWebpage: bristolwatch.com/hall_effect/index.html
Operate, Build Hall Effect Switch Pt. 2 Lewis Loflin 2022-06-11 | Theory-operation by building a Hall-effect switch.Basics of Hall Effect Analog Sensors & Switches Pt. 1youtu.be/ykG4ezJLuZ8Hall Effect Latches Theory and Circuits Pt. 3youtu.be/0zSa_wg3qdkWebpage: bristolwatch.com/hall_effect/index.html
Basics of Hall Effect Analog Sensors & Switches Pt. 1 Lewis Loflin 2022-06-09 | Deep look at Hall sensors, hysteresis, and comparator circuits to build switches and latches.Some graphics courtesy of Melexis Engineering.Operate, Build Hall Effect Switch Pt. 2youtu.be/qoLJU1pAVeUHall Effect Latches Theory and Circuits Pt. 3youtu.be/0zSa_wg3qdkWebpage: bristolwatch.com/hall_effect/index.html
How to Connect Transformers in Series-Parallel Lewis Loflin 2021-10-23 | bristolwatch.com/ele4/xformer.htmHow to safely connect power transformers in series-parallel inputs and outputs.
IR2110 Based High Voltage H-Bridge Motor Control Lewis Loflin 2021-10-13 | bristolwatch.com/ele4/RI2110.htmBetter high voltage h-bridge using Arduino or Raspberry PI.
High Voltage IGBT H-Bridge Circuit Using Photovoltaic Optocouplers Lewis Loflin 2021-08-22 | Use for controlling 120-volt 20 amp DC motor. This is a demo.http://www.bristolwatch.com/ele4/index.htmExploring Photovoltaic Optocouplers as MOSFET Driversyoutu.be/hkSW8WQ4CcYArduino Controlled IR2110 Based H-Bridge HV Motor Controlyoutu.be/d0r-Yx9R3ZsPt. 1 Interfacing Microcontrollers to CMOS and MOSFET Circuitsyoutu.be/XzetdwzcOrYPt. 2 Simplified CMOS-MOSFET H-Bridge Circuityoutu.be/rExHPqTUBuAPt. 3 Tri-State H-Bridge using CD4093B CMOS Circuityoutu.be/b8O4ihdHx8UPt. 1 TB6600 Stepper Motor Driver with Arduinoyoutu.be/PHe2MK9CvQMPt. 2 Program TB6600 Stepper Motor Driver with Arduinoyoutu.be/jtX0t7-m69MArduino Unipolar Stepper Motor Driver Board with Arduino Codeyoutu.be/HTVYiLOY8SQPt. 1 TB6600 Stepper Motor Driver with Arduinoyoutu.be/PHe2MK9CvQMPt. 2 Program TB6600 Stepper Motor Driver with Arduinoyoutu.be/jtX0t7-m69M
SIDAC Controlled Flashtube and Pulse Circuits Lewis Loflin 2021-08-09 | SIDAC or bi-directional silicon power switch is used in AC power switching including xenon and sodium lamps, gas igniters, etc.bristolwatch.com/ele/sidac.htm
Build Autotransformer-Variac AC and DC Power Supply Lewis Loflin 2021-08-08 | Note the schematic in video is wrong with the diode bridge. It has been corrected in the webpage schematic. bristolwatch.com/ele4/variac.htm
Unijunction Transistor SCR Photo Flash Control Circuit Lewis Loflin 2021-08-01 | Using an SCR to turn on a HV photoflash strobe.Understanding Unijunction Transistors Theory Operationbristolwatch.com/ele4/unijunction.htmUnijunction Transistor SCR Photo Flash Control Circuitbristolwatch.com/ele4/flash.htm
Understanding Unijunction Transistors Theory Operation Lewis Loflin 2021-08-01 | Unijunction transistors are widely used in SCR switching circuits.Understanding Unijunction Transistors Theory Operationbristolwatch.com/ele4/unijunction.htmUnijunction Transistor SCR Photo Flash Control Circuitbristolwatch.com/ele4/flash.htm
Measure Current from Constant Current Source with Arduino Lewis Loflin 2021-07-17 | Adding current to voltage convertor with LM358 op-amp provides feedback and live current measurement.bristolwatch.com/ele4/ccs_lm358.htmbristolwatch.com/ele4/css.htmbristolwatch.com/ele4/ohms.htmbristolwatch.com/ele4/ard_stepper.htmbristolwatch.com/ele4/ard_css.htm
Arduino Controlled Constant Current Source Lewis Loflin 2021-07-13 | Upgrade from earlier project to allow Arduino PWM to control power output.The output current limit can be set.bristolwatch.com/ele4/ccs_lm358.htmbristolwatch.com/ele4/css.htmbristolwatch.com/ele4/ohms.htmbristolwatch.com/ele4/ard_stepper.htmbristolwatch.com/ele4/ard_css.htm
Arduino Unipolar Stepper Motor Driver Board & Arduino Code Lewis Loflin 2021-07-13 | Using the popular ULN2003A and TIP125 Darlingtons produces 5-amps up to 48 volts. Includes Arduino code.bristolwatch.com/ele4/ccs_lm358.htmbristolwatch.com/ele4/css.htmbristolwatch.com/ele4/ohms.htmbristolwatch.com/ele4/ard_stepper.htmbristolwatch.com/ele4/ard_css.htm
Constant Current Source Multimeter Trouble Shooting Lewis Loflin 2021-07-13 | Close examination of operation and using a multimeter for trouble shooting.bristolwatch.com/ele4/ccs_lm358.htmbristolwatch.com/ele4/css.htmbristolwatch.com/ele4/ohms.htmbristolwatch.com/ele4/ard_stepper.htmbristolwatch.com/ele4/ard_css.htm
Ohms Law Review for Constant Current Source Lewis Loflin 2021-07-13 | Needed to better understand CCS trouble shooting in following video.bristolwatch.com/ele4/ccs_lm358.htmbristolwatch.com/ele4/css.htmbristolwatch.com/ele4/ohms.htmbristolwatch.com/ele4/ard_stepper.htmbristolwatch.com/ele4/ard_css.htm
Arduino with PCF8574P Switches Toggle On-Off LEDs Lewis Loflin 2020-07-15 | Program an Arduino connected to PCF8574 GPIO expander detects switches toggle associated LEDs on-off. Part 2 of 3. Also, see the introduction video:youtu.be/LveEG36OOkESchematics, etc: http://www.bristolwatch.com/picaxe2/dd6.htmhttp://www.bristolwatch.com/picaxe2/dd8.htm
Introduction PCF8574P GPIO Expander Arduino, Picaxe Lewis Loflin 2020-07-15 | Covers basic operation of PCF8574P 8-bit GPIO expander. Other videos will show how to Connect Arduino, Picaxe, and Raspberry Pi.Schematics-Info:http://www.bristolwatch.com/picaxe2/dd6.htmhttp://www.bristolwatch.com/picaxe2/dd8.htm
Pt. 3 Tri-State H-Bridge using CD4093B CMOS Circuit Lewis Loflin 2020-06-15 | Schematic: http://www.bristolwatch.com/picaxe2/dd4.htmPart of 3 of 3.Pt. 1 Interfacing Microcontrollers to CMOS and MOSFET Circuitsyoutu.be/XzetdwzcOrYPt. 2 Simplified CMOS-MOSFET H-Bridge Circuityoutu.be/rExHPqTUBuAHigh Voltage IGBT H-Bridge Using Photovoltaic Optocouplersyoutu.be/azJo4h-ei6IArduino Controlled IR2110 Based H-Bridge HV Motor Controlyoutu.be/d0r-Yx9R3ZsPt. 1 TB6600 Stepper Motor Driver with Arduinoyoutu.be/PHe2MK9CvQMPt. 2 Program TB6600 Stepper Motor Driver with Arduinoyoutu.be/jtX0t7-m69MArduino Unipolar Stepper Motor Driver Board with Arduino Codeyoutu.be/HTVYiLOY8SQ
Pt. 2 Simplified CMOS-MOSFET H-Bridge Circuit Lewis Loflin 2020-06-15 | Schematic: http://www.bristolwatch.com/picaxe2/dd5.htmPart 2 of 3Pt. 1 Interfacing Microcontrollers to CMOS and MOSFET Circuitsyoutu.be/XzetdwzcOrYPt. 3 Tri-State H-Bridge using CD4093B CMOS Circuityoutu.be/b8O4ihdHx8UHigh Voltage IGBT H-Bridge Using Photovoltaic Optocouplersyoutu.be/azJo4h-ei6IArduino Controlled IR2110 Based H-Bridge HV Motor Controlyoutu.be/d0r-Yx9R3ZsPt. 1 TB6600 Stepper Motor Driver with Arduinoyoutu.be/PHe2MK9CvQMPt. 2 Program TB6600 Stepper Motor Driver with Arduinoyoutu.be/jtX0t7-m69MArduino Unipolar Stepper Motor Driver Board with Arduino Codeyoutu.be/HTVYiLOY8SQ
Pt. 1 Interfacing Microcontrollers to CMOS and MOSFET Circuits Lewis Loflin 2020-06-15 | Schematics: http://www.bristolwatch.com/picaxe2/dd7.htmPart 1 of three.Pt. 2 Simplified CMOS-MOSFET H-Bridge Circuityoutu.be/rExHPqTUBuAPt. 3 Tri-State H-Bridge using CD4093B CMOS Circuityoutu.be/b8O4ihdHx8UHigh Voltage IGBT H-Bridge Using Photovoltaic Optocouplersyoutu.be/azJo4h-ei6IArduino Controlled IR2110 Based H-Bridge HV Motor Controlyoutu.be/d0r-Yx9R3ZsPt. 1 TB6600 Stepper Motor Driver with Arduinoyoutu.be/PHe2MK9CvQMPt. 2 Program TB6600 Stepper Motor Driver with Arduinoyoutu.be/jtX0t7-m69MArduino Unipolar Stepper Motor Driver Board with Arduino Codeyoutu.be/HTVYiLOY8SQ
Pt. 2 Program TB6600 Stepper Motor Driver with Arduino Lewis Loflin 2020-05-20 | Part 1 youtu.be/PHe2MK9CvQMhttp://www.bristolwatch.com/picaxe2/tb6600_arduino.htmBought one and tested unit with Arduino. Pt. 1 is hardware, Pt. 2 is programming.Other stepper motor related videos:High Voltage IGBT H-Bridge Circuityoutu.be/azJo4h-ei6IArduino Controlled IR2110 Based H-Bridge HV Motor Controlyoutu.be/d0r-Yx9R3ZsPt. 1 Interfacing Microcontrollers to CMOS and MOSFET Circuitsyoutu.be/XzetdwzcOrYPt. 2 Simplified CMOS-MOSFET H-Bridge Circuityoutu.be/rExHPqTUBuAPt. 3 Tri-State H-Bridge using CD4093B CMOS Circuityoutu.be/b8O4ihdHx8UArduino Unipolar Stepper Motor Driver Board with Arduino Codeyoutu.be/HTVYiLOY8SQ
Pt. 1 TB6600 Stepper Motor Driver with Arduino Lewis Loflin 2020-05-20 | Part 2: youtu.be/jtX0t7-m69Mhttp://www.bristolwatch.com/picaxe2/tb6600_arduino.htmBought one and tested unit with Arduino. Pt. 1 is hardware, Pt. 2 is programming.Other stepper motor related videos:High Voltage IGBT H-Bridge Circuityoutu.be/azJo4h-ei6IArduino Controlled IR2110 Based H-Bridge HV Motor Controlyoutu.be/d0r-Yx9R3ZsPt. 1 Interfacing Microcontrollers to CMOS and MOSFET Circuitsyoutu.be/XzetdwzcOrYPt. 2 Simplified CMOS-MOSFET H-Bridge Circuityoutu.be/rExHPqTUBuAPt. 3 Tri-State H-Bridge using CD4093B CMOS Circuityoutu.be/b8O4ihdHx8UArduino Unipolar Stepper Motor Driver Board with Arduino Codeyoutu.be/HTVYiLOY8SQ
Short Video Using PuTTY Terminal Program and USB to RS-232 Lewis Loflin 2020-05-20 | PuTTY is a free terminal program I use on Arduino and PICAXE.Also the Ugreen USB to RS-232 convertor.http://www.bristolwatch.com/index.htm
Compare 2N3055 and MJE10005 Transistor Power Switches Lewis Loflin 2020-05-20 | Transistor circuit theory. http://www.bristolwatch.com/picaxe2/dd3.htmThis comes from live circuit tests, not simulators.
Build TC4420 MOSFET Driver Replacement Circuits Lewis Loflin 2020-05-20 | http://www.bristolwatch.com/picaxe2/dd2.htmMore circuit theory. CMOS gates and MOSFETs.
Common Collector Opto-Isolated Bipolar Transistor Switches Lewis Loflin 2020-05-20 | Transistor theory. http://www.bristolwatch.com/picaxe2/dd1.htm
CMOS CD4040 Used as a Frequency Divider from DS1307 RTC Lewis Loflin 2020-04-15 | See earlier video: youtu.be/Xp6-6MnJhtQWebpages:http://www.bristolwatch.com/picaxe2/index.htmhttp://www.bristolwatch.com/picaxe2/cd4040.htm
Use DS1307 Square Wave Out as a Crystal Time Base Lewis Loflin 2020-04-15 | Alternate use for a DS1307 real-time clock using the square wave output.http://www.bristolwatch.com/picaxe2/index.htmhttp://www.bristolwatch.com/picaxe2/cd4040.htm
Pt. 3 TC4420 MOSFET Driver H-Bridge Circuit Lewis Loflin 2020-04-06 | The final installment on using the TC4420-TC4429 MOSFET drivers operating an H-Bridge circuit. Displays actual circuit operation.Parts 1 and 2:youtu.be/5lxxiC1HtBk Introductionyoutu.be/-Pmhx_ebJKM Example CircuitsRelated webpages:http://www.bristolwatch.com/TC4420/index.htmhttp://www.bristolwatch.com/TC4420/TC4420hb.htmhttp://www.bristolwatch.com/TC4420/TC4420hb2.htm
Pt. 2 TC4420-29 MOSFET Drivers Circuit Examples Lewis Loflin 2020-04-05 | Pt. 1 Intro. TC4420-TC4429 High Power MOSFET Driversyoutu.be/5lxxiC1HtBkPt. 3 TC4420 MOSFET Driver H-Bridge Circuityoutu.be/h_0t50j0BxMhttp://www.bristolwatch.com/TC4420/index.htmhttp://www.bristolwatch.com/TC4420/TC4420hb.htmhttp://www.bristolwatch.com/TC4420/TC4420hb2.htm
Pt. 1 Intro. TC4420-TC4429 High Power MOSFET Drivers Lewis Loflin 2020-04-04 | Simple ICs for interfacing Arduino, Raspberry Pi to power MOSFETs.Part 1 of 3. From simple circuits to applications.Pt. 2 TC4420-29 MOSFET Drivers Circuit Examplesyoutu.be/-Pmhx_ebJKMPt. 3 TC4420 MOSFET Driver H-Bridge Circuityoutu.be/h_0t50j0BxMWebpage:http://www.bristolwatch.com/TC4420/index.htmhttp://www.bristolwatch.com/TC4420/TC4420hb.htmhttp://www.bristolwatch.com/TC4420/TC4420hb2.htm
High Efficiency MOSFET H-Bridge Circuit Lewis Loflin 2019-12-30 | Schematic: http://www.bristolwatch.com/ele3/ele8.htmP-channel MOSFET - IRF4905N-channel MOSFET - IRFZ40
Parallel P-Channel MOSFETs Results, Observations Lewis Loflin 2019-12-07 | Live test of p-channel MOSFETs including parallel connections.
N-Channel MOSFETs Test Results, Observation Lewis Loflin 2019-12-07 | Tested electrical properties of on-resistance, current, voltage drop. Select the best type for Arduino and other microcontrollers.Weblink for tables, data, and schematics:http://www.bristolwatch.com/ele3/mosfet_test.htm
Reality of Recycling Low-Value Ewaste Lewis Loflin 2019-11-30 | Why so much Ewaste ends up in poor countries. Why recycling sometimes makes no economic or environmental sense.http://www.bristolwatch.com
Driving High-Power Darlington Transistors Lewis Loflin 2019-11-30 | Why an Arduino can't drive higher power transistor devices.http://www.bristolwatch.com/index.htm
Magnetron Operation Information Do Not Disassemble! Lewis Loflin 2019-11-21 | Some magnetron theory on magnets. Do Not Disassemble the magnetron due to possible exposure to toxic material.http://wwwbristolwatch.com/index.htm
Overview Toshiba IGBT Application Notes Lewis Loflin 2019-11-20 | http://www.bristolwatch.comDownload the application notes athttp://www.bristolwatch.com/ele3/toshiba.pdf
Four MOSFET Tri-State Switch Lewis Loflin 2019-11-20 | A not so practical switch simply an example.http://www.bristolwatch.com/ele3/index.htm
MOSFETs and Electron Flow Lewis Loflin 2019-11-19 | A look at how current in MOSFETs and other devices is not positive to negative. A review of older technology some of it still in use.http://www.bristolwatch.com/index.htm
3.3 Volt Logic Controls H-Bridge TTL Input Lewis Loflin 2019-11-17 | http://www.bristolwatch.com/ele3/index.htm
Questions on Raspberry Pi, SN7407, ULN2003 Lewis Loflin 2019-11-15 | Discussion of visitor questions.http://www.bristolwatch.com/ele3/index.htm
Why Your MOSFET Transistors Get Hot Lewis Loflin 2019-11-13 | How to choose the proper MOSFET for a H-Bridge.http://www.bristolwatch.com/ele3/index.htm
OptoCoupler Interfacing H-Bridge Circuits Lewis Loflin 2019-11-13 | Updated Optocoupler Circuits more oriented towards interfacing.http://www.bristolwatch.com/ele/index.htm
Simple Digital CMOS - TTL Interface Circuits Lewis Loflin 2019-11-13 | How to build simple digital circuits from a few parts and transistors.http://www.bristolwatch.com/ele3/index.htm
H-Bridge Driving Large Motor Lewis Loflin 2019-11-08 | Tri-State H-Bridge demo schematics, etc athttp://www.bristolwatch.com/ele3/index.htm
Tri-State H-Bridge Live Demo Lewis Loflin 2019-10-27 | Actual bread-boarded working circuit demo.Related:http://www.bristolwatch.com/ele3/index.htmlhttp://www.bristolwatch.com/ele3/index.htmhttp://www.bristolwatch.com/ele3/buffer.htmhttp://www.bristolwatch.com/ele3/ele1.htmhttp://www.bristolwatch.com/ele3/ele2.htmhttp://www.bristolwatch.com/ele3/ele3.htmhttp://www.bristolwatch.com/ele3/ele4.htmhttp://www.bristolwatch.com/ele3/ele5.htmhttp://www.bristolwatch.com/ele3/ele6.htmhttp://www.bristolwatch.com/ele3/ele7.htm
Introduction Tri-State H-Bridge Motor Controls Lewis Loflin 2019-10-27 | http://www.bristolwatch.com/ele3/index.htmA series of videos on many aspects of transistors, CMOS and TTL logic, optocouplers, general digital electronics.
