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Hand-to-Hand Body Composition Meter Reference Design with BLE Connectivity - This reference design is for a complete hand-held body composition or fat loss monitor end equipment featuring TI signal chain, power, and connectivity components. With Ti’s AFE4300 body composition AFE, you can accelerate your body composition design to develop more quickly. This reference design also includes the full BLE connectivity design for easy interface to BLE enabled smartphones, tablets, etc.__ Texas Instruments
Handy Tester - For beginners, here’s a low-cost multitester that can be used to test the condition of almost all the electronic components from resistors to IC s. it uses only a few components but...__ Electronics Projects for You
Handy Zener Diode Tester - Here is a handy zener diode tester which tests zener diodes with breakdown voltages extending up to 120 volts. The main advantage of this circuit is that it works with a...__ Electronics Projects for You
Hardware Histogram Speeds ADC Test - 11/13/03 EDN Design Ideas: Accumulating enough samples to effectively and accurately measure linearity errors in pipeline converters at production test and minimizing test time are difficult enough. Add to that multiple sites, multiple channels, and the expe Design by Tony Zizzo Jr, Texas Instruments, Tucson, AZ
HC-11 Evaluation Board - Build a low-cost evaluation board for Motorola 68HC11. Downloadable BUFFALO V3.4 to 32kB SRAM for learning __ Designed by Wichit Sirichote
Hearing Aid - This low-cost, general-purpose electronic hearing aid works off 3V DC (2x1.5V battery).in this circuit, transistor T1 and associated components form the audio signal preamplifier for the acoustic signals picked up by...__ Electronics Projects for You
Heart rate measurement from fingertip. Part 1. Schematic - introduction Heart rate measurement indicates the soundness of the human cardiovascular system. This project demonstrates a technique to measure the heart rate by sensing the change in blood volume in a finger artery while the heart is pumping the__
Heart rate measurement from fingertip. Part 2. Software - Part 1. Schematic Software The firmware does all the control and computation operation. in order to save the power, the sensor module is not activated continuously. instead, it is turned on for 15 sec only once the start button is pressed. The__
Heart Rate Monitor based on a dual op-amp IC - Strictly speaking, this simple circuit shouldn't work! How could anyone expect an ordinary light dependent resistor photo cell to 'see' through a fingertip in natural daylight and detect the change in blood flow as the heart pulsates? The secret is a high gain circuit, based on a dual op amp IC which can be either the low power LM358 or the JFET TL072. __ Learning Electronics
Heart rate sensor - Medical and health related electronic circuit diagrams / circuit schematics__
Heartbeat Sensor (Tranduscer) - To build a heart-beat transducer not as difficult as imagined. Circuit below shows a simple heart-beat transducer.__
Heartbeat transducer using infrared LED / Detector - Medical and health related electronic circuit diagrams / circuit schematics__
Heat Control Unit - This circuit will turn the heater ‘on’ when the temperature of water falls below the lower limit set by you and turn it ‘off’ when the temperature increases above the higher...__ Electronics Projects for You
Heat Sensitive Switch - At the heart of this heat-sensitive switch is IC LM35 (IC 1) , which is a linear temperature sensor and linear temperature-to-voltage converter circuit. The converter provides accurately linear and directly proportional output signal in millivolts over the temperature range of 0°C to 155°C. it develops an output voltage of 10 mV per degree centigrade change in__
Heat Sensor - The Thermistor, or NTC (Tony van Roon's Negative Temperature Coefficient) of 10K, is a standard type. Most types will work. The one in the diagram is a 10K model made by Fenwal (Tony van Roon's #197-103LAG-A01) __ Designed by Tony van Roon VA3AVR
Heath EU-14A Special Experimental Parts specs & schematic - Circuit Only __ Designed by HEATH KIT
Heath EUP-26 VOM specs & schematic - Circuit Only __ Designed by HEATH KIT
Heath EUW-16 Voltage Reference Source specs & schematic - Circuit Only __ Designed by HEATH KIT
Heath EUW-17 Transistor Power Supply specs & schematic - Circuit Only __ Designed by HEATH KIT
Heath EUW-19A Operational Amplifier System specs & schematic - Circuit Only __ Designed by HEATH KIT
Heath EUW-20A Servo-Recorder specs & schematic - Circuit Only __ Designed by HEATH KIT
Heath EUW-24 VTVM specs & schematic - Circuit Only __ Designed by HEATH KIT
Heath EUW-25 DC Oscilloscope specs & schematic - Circuit Only __ Designed by HEATH KIT
Heath EUW-27 Sine-Square Wave Generator specs & schematic - Circuit Only __ Designed by HEATH KIT
Heathkit AV-1 AC voltmeter - Schematic Only__
Heathkit G-5 Signal generator - Schematic Only__
Heathkit Groundtrack GR-1290 VLF metal Detector & Detector coil construction notes - Schematic Only, no circuit description __ Designed by hobbyteam @ hobby-hour.com
Heathkit HM-10A Tunnel Dipper - Schematic Only__
Heathkit IB-2 impedance bridge schematic - Schematic Only__
Heathkit IM-18 VTVM schematic (similar to Most other Heath VTVMs) - Circuit Only __ Designed by HEATH KIT
Heathkit IP-17 0-400V regulated power supply schematic - Circuit Only __ Designed by HEATH KIT
Heathkit IP-27 LV regulated power supply - Schematic Only__
Heat-Sensitive Switch - At the heart of this heat-sensitive switch is IC LM35 (IC 1) , which is a linear temperature sensor and linear temperature-to-voltage converter circuit. The converter provides accurately linear and directly proportional output signal...__ Electronics Projects for You
Hewlett-Packard 206A AF oscillator schematic - Circuit Only __ Designed by Hewlett-Packard
Hewlett-Packard 400 AF VTVM manual w/schematic - Circuit Only __ Designed by Hewlett-Packard
HF AC Millivoltmeter adapter - intended for use past 200 kHz, this adapter changes HF AC voltages between 2 mv P-P and 200 mv P-P to the corresponding DC level with linearity of better than 1 millivolt. A on-board calibration signal aids in calibration prior to use. __ Designed by Dick Cappels
HF/VHF/UHF Test Oscillator - This test oscillator covers 16 MHz to 300 MHz in six bands, using varactor tuning. it has a high level output to drive a frequency meter and two sine wave outputs, one of which is 50 Ohms.
This article was published in Croatian in infoelektronika magazine in June, 2012 (cooperatively) __ Designed by Dick Cappels
High & Low Voltage Cut Off with Time Delay - The power line fluctuations and cut-offs cause damages to electrical appliances connected to the line. it is more serious in the case of domestic appliances like fridge and air conditioners. if a fridge is operated on low voltage, excessive current flows through the motor, which heats up, and get damaged __ Contact IQ Technologies
High Capacity Alternative to 9 Volt Battery - Get ten times the capacity of a 9 Volt battery to power your devices. __ Designed by REUK-Renewable Energy UK website
High Current, High Voltage Battery Capacity Meter - ideal for solar power battery monitoring but also perfect for a wide variety of rechargeable battery applications, this smart battery meter monitors the charge and discharge of lead-acid, NIC ad and NiMH
batteries with an operating voltage range of 9-60V and currents up to 80A. it has settable overload and under-voltage protection and it can be connected to a PC for logging of battery condition.__ SiliconChip
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