Sursa de alimentare reglabila liniar

Diferenta dintre aceasta sursa de alimentare si una clasica este aceea ca terminalul cursorului si cel “de masa” ale potentiometrului sunt legate impreuna. Acest simplu fapt permite imbunatatirea unora dintre circuitele echivalenta, folosirea unui potentiometru liniar este necesara.

Cativa dintre parametrii montajului:
tensiunea de intrare: 28V -37V; tensiunea de iesire: reglabila intre 2V si 25V; curent maxim de iesire : 2A.
De remarcat de disipatia lui MJ300Q poate creste pana la 50W; in acest caz este necesar un radiator termic de 1.5K/W.

Schema sursa alimentare

Reprinted Url Of This Article:http://www.hqew.net/circuit-diagram/Sursa-de-alimentare-reglabila-liniar_12174.html

Amplificator audio auto 50 W stereo

Un amplificator audio stereo proiectat cu RDA1562, pt auto cu o putere de 50W. Mai jos atasam si desenele cu cablajele si pozitionarea pieselor.

Schema amplif auto 50W TDA1562

TDA7388 PT2272

Cablaj PCB amplificator audio 50W

2 rezistente 1 KOhms
2 rezistente 4,7 KOhms
2 rezistente 100 KOhms
2 rezistente 1 MOhms
4 condensatori 470 nF LCC 63V
4 condensatori 10 μF 63V radiaux
6 condensatori 4 700 μF 25V radiaux
2 condensatori 100 nF LCC
1 condensatori10 000μF 25V radial (pas sur le schema => filtrage alim)
2 x LED
2 x TDA1562Q
2 intrerupatoare unipolaires
2 radiatoare (Rth < 2.5°C/W) ( pasta termica)
Documentatie in limba franceza -> amplif-audio-auto-50w.pdf

Sursa alimentare tensiune MJ3001

Cu valorile specificate pt componente, aceasta sursa de alimentare livreaza o tensiune de iesire de 12V. Pt alte tensiuni de iesire, adaptati doar divizorul de tensiune, asigurandu-va ca prin P1, R2 si R3 aveti cel putin 1 mA. Acest lucru este necesar pt ca incarcarea produsa de curentul de intrare a lui TL431C sa fie neglijabila (2uA). Tranzistorul de putere este un Darlington cu amplificarea in curent de minim 1000 la un curent de emitor de 5mA.

74HC4052 PDF       MB6S PDF         SK34 PDF       KA5L0380R PDF

Cablajul proiectat pt aceasta sursa de tensiune include complet partea de redresare, adica o punte redresoare, un condensator-tampon si o siguranta. Condensatorul-tampon si radiatorul pt T1 sunt suficient de mari pt curenti de iesire de pana la 2A.

Cablaj PCB sursa alimentare

Daca aveti nevoie de un curent mai mare, de pana la 5A, montati tranzistorul de putere in afara placii si montati-l pe un radiator mai mare. De asemenea , mariti capacitatea condensatorului de 10000 uF. Un curent continuu de iesire de 5A necesita in plus si racirea puntii redresoare.

Schema electronica sursa de alimentare

Reprinted Url Of This Article: http://www.hqew.net/circuit-diagram/Sursa-alimentare-tensiune-MJ3001_12179.html

Emitator TV simplu cu 2 tranzistori

Un emitator tv simplu in banda VHF ce foloseste modulare negativa a sunetului si modulare video PAL. Este potrivit tarilor in care se foloseste sistemul TV B si G.

Reprinted Url Of This Article: http://www.hqew.net/circuit-diagram/Emitator-TV-simplu-cu-2-tranzistori_12183.html

High Current Regulator Circuit Using LM105

A circuit for a 10A regulator is shown in this circuit. A third NPN transistor has been included to get higher current. A low frequency device is used for Q3 because it seems to better withstand abuse. However, high frequency transistors must be used to drive it. Q2 and Q3 are both double diffused transistors with good frequency response. This insures that Q3 will present the dominant lag in the feedback loop through the booster transistors, and back around the output transistor of the LM105. This is further insured by the addition of C3. Here is a schematic drawing:

High Stability Regulator Circuit Using LM108

A precision regulator that employs the IC thusly is shown in this circuit. An operational amplifier compares the output voltage with the output voltage of a reference zener. The op amp controls the LM108 by driving the ground terminal through an FET. The load and line regulation of this circuit is better than 0.001%. Noise, drift and long term stability are determined by the reference zener, D1. Noise can be reduced by inserting 100 k, 1% resistors in series with both inputs of the op amp and bypassing the non-inverting input to ground. A 100 pF capacitor should also be included between the output and the inverting input to prevent frequency instability. Temperature drift can be reduced by adjusting R4, which determines the zener current, for minimum drift. Here is a schematic drawing:

Source Circuit : http://www.hqew.net/circuit-diagram/High-Stability-Regulator-Circuit-Using-LM108_12120.html

Simple Power Saving Devices

If you need a tool to save electricity you use, so in this article a simple power saving device circuit diagram is very suitable for you to test. Basically, this tool can really save electricity in your home from 10-25%. Work of this tool is simply to reduce the number of cosines of the AC current curves which will be read on a gauge to measure a mile in your home. The power saving device will work if there is an AC load through a coil of wire sensors to measure the amount of AC current through it. Or a scientific theory is how we can reduce the possibility of the largest peak (peak of the curve of AC (sine-cosine) to read so low.power savingdevice component which affects the flow of AC and condenser or capacitor or inductor loop. You can do is flow air conditioner filters before entering the electricity network in your home. Here is a schematicpower savingdevice drawing:

Create the circuit in a plastic box. then use a capacitor with good quality, the more expensive the better. to SW is functioning as a safety in case of short circuiting due to the capacitor.