Circuit Diagram

Simple 75M SSB rig with PTT

Published:2013/5/2 22:22:00 Author:muriel | Keyword: Simple 75M , SSB rig , PTT

The output of the Tx mixer is buffered by a 2N4401 emitter follower to drive the low impedance input side of a 10.7 MHz IF transformer. The transformer is returned to 75 meters by an additional, external 330 p cap. A second IF transformer is used to make a double tuned band pass filter, although for 75 meters.   (View)

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PBUS communication bus for connecting microcontroller-based devices

Published:2013/5/2 22:20:00 Author:muriel | Keyword: PBUS communication bus, connecting microcontroller-based devices

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MIDI to RS232 Interface

Published:2013/5/2 22:19:00 Author:muriel | Keyword: MIDI to RS232 Interface

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Solar charger for lead-acid batteries 2

Published:2013/5/2 22:13:00 Author:muriel | Keyword: Solar charger, lead-acid batteries

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12V battery charger with 12V input

Published:2013/5/2 22:12:00 Author:muriel | Keyword: 12V battery charger, 12V input

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AA Battery Solar Charger

Published:2013/5/2 21:38:00 Author:muriel | Keyword: AA Battery , Solar Charger

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Batwatch-Solar panel battery charger

Published:2013/5/2 21:37:00 Author:muriel | Keyword: Batwatch-Solar panel , battery charger

Batwatch is a simple monitor for a solar panel battery charger, using an Atmel ATtiny13V. It periodically measures the charge current and battery voltage, and shows them by blinking two LEDs. The circuit built into the plug of a VW solar charger panel that is used to prevent a discharge of the battery when a car is not used for some time. A modern car contains a large amount of electronics, and a quiescent current of 40-50mA .   (View)

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Solar charger for lead-acid batteries

Published:2013/5/2 21:36:00 Author:muriel | Keyword: Solar charger , lead-acid batteries

This circuit is intended for charging sealed lead-acid batteries with a solar panel in small and portable applications. The customary diode that prevents the battery from discharging through the solar panel has been replaced by a FET-comparator combination. The charger will stop charging once a pre-set voltage (temperature compensated) has been reached, and recommence charging when the voltage has dropped off sufficiently. The load is disconnected when the battery voltage drops below 11V and reconnected when it gets back to 12.5V.   (View)

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10 Amp Solar Charge Controller by LM324

Published:2013/5/2 21:35:00 Author:muriel | Keyword: 10 Amp , Solar Charge Controller, LM324

This is a solar charge controller, it’s function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery. It features easy setup with one potentiometer for the float voltage adjustment, an equalize function for periodic overcharging, and automatic temperature compensation for better charging over a range of emperatures.   (View)

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CEMF Charger

Published:2013/5/2 21:34:00 Author:muriel | Keyword: CEMF Charger

This is s simple circuit of a CEMF charger.The CEMF charger uses the CEMF (counterelectromotive force) from an inductor to charge a capacitor to high voltages from a low voltage source.When the button is pushed the inductor will generate a small amount of CEMF that will charge the capacitor. When the button is released the inductor generates more CEMF that charges up the capacitor further.   (View)

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Car Battery Chargers

Published:2013/5/2 21:33:00 Author:muriel | Keyword: Car Battery Chargers

This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycle has finished.   (View)

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A Self-Contained “67.5 volt B Battery” for Portables

Published:2013/5/2 21:31:00 Author:muriel | Keyword: Self-Contained, 67.5 volt , B Battery, Portables

This article describes the construction of an AA battery powered 67 1/2 volt “battery”. This new rechargeable “B battery” is slightly smaller than the original Eveready 467 battery and is the same weight. The substitute battery can be made in different voltages and can be powered from a wide variety of sources.   (View)

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Simplest DIY Li-Polymer Charger Schematic

Published:2013/5/2 21:27:00 Author:muriel | Keyword: Simplest DIY , Li-Polymer Charger

This is a Lithium-ion charger for lipo batteries. Circuit schematic shows configuration for charging single 3.7V lipo battery but voltage can be set to charge several batteries in series. Lipo charger sets a current limit with the LM317, and 1 resistor, and the voltage limit with the TL431, and 2 resistors.   (View)

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USB Li-ion battery charger

Published:2013/5/2 21:24:00 Author:muriel | Keyword: USB Li-ion, battery charger

This is a charger for lithium ion batteries which takes its power from the USB port of a computer.It uses the MCP73861 or MCP73863 Li-ion battery charger chip manufactured by Microchip.The circuit is very simple to build based on the application note.   (View)

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Mobile Phone Battery Charger

Published:2013/5/2 21:19:00 Author:muriel | Keyword: Mobile Phone , Battery Charger

The circuit presented here comes as a low-cost alternative to charge mobile telephones/battery packs with a rating of 7.2 volts, such as Nokia 6110/6150.   (View)

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Lithium-Ion Linear Battery Charger with Thermistor Interface

Published:2013/5/2 21:18:00 Author:muriel | Keyword: Lithium-Ion Linear, Battery Charger, Thermistor Interface

Here is a Lithium-Ion Linear Battery Charger with Thermistor Interface with the LTC4050-4.X from Linea technology.The LTC 4050-4.1 and LTC4050-4.2 are complete standalone constant-current/constant-voltage linear charge controllers for lithium-ion (Li-Ion) batteries. Charge current is programmable and final float voltage has ±1% accuracy.   (View)

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Li Polymer Battery Charger with ISL6292

Published:2013/5/2 21:17:00 Author:muriel | Keyword: Li Polymer , Battery Charger , ISL6292

This is a Li-ion/Li Polymer Battery Charger with ISL6292 which is an integrated single-cell Li-ion or Li-polymer battery charger capable of operating with an input voltage as low as 2.4V. This charger is designed to work with various types of AC adapters or a USB port.The ISL6292 operates as a linear charger when the AC adapter is a voltage source. The battery is charged in a CC/CV (constant current/constant voltage) profile. The charge current is programmable with an external resistor up to 2A.   (View)

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Solar Cell charges single NiCd AA

Published:2013/5/2 21:14:00 Author:muriel | Keyword: Solar Cell, single NiCd AA

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USB Powered AA NiMH – NiCd Battery Charger by LM393

Published:2013/5/2 21:13:00 Author:muriel | Keyword: USB Powered AA NiMH , NiCd Battery Charger, LM393

The charger in this project is designed to charge two AA NiMH or NiCd cells of any capacity (as long as they are the same) at about 470mA. It will charge 700mAh NiCds in about 1.5 hours, 1500mAh NiMHs in about 3.5 hours, and 2500mAh NiMHs in about 5.5 hours. The charger incorporates an automatic charge cut-off circuit based on cell temperature, and the cells can be left in the charger indefinitely after cut-off.   (View)

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3A battery charger

Published:2013/5/2 21:11:00 Author:muriel | Keyword: 3A , battery charger

This design is a 3A battery charger intended for use with 5-cell Ni-Cd or Ni-MH battery packs (but can be modified to suit other numbers of cells). The circuit includes automatic shutoff that occurs when the battery temperature rises 10°C above ambient.This battery charger was developed specifically for applications using either Nickel-Cadmium (Ni-Cd) or Nickel-Metal Hydride (Ni-MH) batteries that will accept a 3A fast-charge rate, and provides automatic shutoff of the high-current charge when the battery is full.The circuit use LM2576.   (View)

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