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A Handy Pen Torch
Pen Torch Electronic Circuit Schematic
AC majors powered battery charger for the pen torch
A Handy Pen Torch
This straightforward to construct “Handy pen torch” digital circuit and low part rely, makes use of two power white LEDs for lighting fixtures. Low volt (4.8V dc) supply on hand from the built in rechargeable Ni-Cd battery pack is first converted into two channel (independent) constant current supplys with the support of two items of the in demand precision adjustable shunt regulator chip LM334 (IC1 and IC2). Around 25mA at three.6 volt dc is to be had on the output of these ICs.
This regulated dc provide is used to power two power white LEDs D4 and D6. Resistors R3 and R5 restricts the output present (and hence the light output) of IC1 and IC2 circuits respectively. Besides these parts, one purple colour LED (D2) is integrated in the primary circuit which works as a battery charging provide input indicator. Resistor R1 restricts the operating current of this LED.
This regulated dc provide is used to power two power white LEDs D4 and D6. Resistors R3 and R5 restricts the output present (and hence the light output) of IC1 and IC2 circuits respectively. Besides these parts, one purple colour LED (D2) is integrated in the primary circuit which works as a battery charging provide input indicator. Resistor R1 restricts the operating current of this LED.
Pen Torch Electronic Circuit Schematic
Diode D1 works as an input polarity defend cum reverse current glide preventer. Capacitor C1 is an easy buffer for circuit stabilization. After succesful development, ideally on a small piece of basic purpose PCB, enclose the whole circuit in an acceptable and engaging pen torch cabinet. If important, drill appropriate holes in the cupboard to attatch the dc socket, on/off swap and the enter indicator and many others. In prototype,commonly available 4.8 volt/500mah Ni-Cd battery pack (for cordless phones) is used.
One very simple but dependable ac primarys powered battery charger circuit for the at hand pen torch can also be included here. Basically the pen torch circuit is a continuing current charger wired round Transistor T1 (BC636), energyed by using a 12v/350mA step down transformer and associated elementsD1, D2 and C1.
One very simple but dependable ac primarys powered battery charger circuit for the at hand pen torch can also be included here. Basically the pen torch circuit is a continuing current charger wired round Transistor T1 (BC636), energyed by using a 12v/350mA step down transformer and associated elementsD1, D2 and C1.
AC majors powered battery charger for the pen torch
Unregulated 12 volt dc available from the enter energy convereter circuit, comprising step down transformer(TRF), rectifier diodes (D1,D2) and filter capacitor (C1), is fed to T1 via a current restricting resistor R1. Grounded base PNP transistor T1 here works as a relentless present generator. With 22 ohm resistor for R1, the charging present to be had on the output of the charger is close to 50mA.
Red LED (D3) provides a set voltage reference to the base of T1, with the assist of resistor R2. (During charging course of, Diode D1 in the primary circuit stop reverse current waft from the battery pack when charging input supply is absent.) After construction of the pen torch circuit, match the assembled unit inside of a small plastic enclosure for security and comfort.
Red LED (D3) provides a set voltage reference to the base of T1, with the assist of resistor R2. (During charging course of, Diode D1 in the primary circuit stop reverse current waft from the battery pack when charging input supply is absent.) After construction of the pen torch circuit, match the assembled unit inside of a small plastic enclosure for security and comfort.
Circuit Source: DIY Electronics Projects
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