Collection Schematic

Thursday, November 20, 2014

Troubleshooting STR IC Regulator Power Supply

A. Unable to start.

Can be caused by:

No start-up voltage supply Vcc or a voltage less than 16V
Electrolityc Capacitors supply voltage Vcc filter dry.

2. Led indicator blinking

If the supply voltage Vcc examined rocking. This is because the regulator of life and death because OVLO work., Die-protectionist regulators and auto start life over and over. If it is turned off Electrolityc Capacitors usually still keep the rest of the cargo.

Can be caused by:

Electrolityc Capacitors supply voltage Vcc filter on a pin-4 dry. Replace with a value equal to or slightly larger. - triger UVLO
input filter capacitor on pin-1 feed dry behind the declining value - triger OLP
Rectifier diode of the switching transformer is damaged (sometimes when examined with avo-meter looks like a still good)
cause the supply voltage Vcc drops of the switching transformer (UVLO)
Part damage or broken lines on the feedback circuit of the voltage regulator through B to photocoupler - triger OVP
Electrolityc Capacitors dry filter voltage B - triger OVP
One of the output voltage of the switching transformer secondaries there is a short (over load) - triger OLP
Soft start capacitor value decreases - triger OLP

3. Noise arising (noise)

Can be caused by:

Transformer windings slack.
If there are ceramic capacitors - can sometimes cause interference noise due to its characteristic piezoelectrik like crystal resonator. Replace with film capacitors.

4. When the st-by normal stress. But when the power is on the regulator directly off protectionism no voltage on the secondary this part. Electrolityc Capacitors are still storing charge.

Can be caused by:

Sensor OVP small value resistor on pin-2 to the ground so that the value of delayed triger to OLP or OCP.
Regulator IC is damaged

Thursday, November 6, 2014

Monday, October 13, 2014

LM723 CA3140 2N3055 Variable Regulator 0 30V 5A

Circuit_Variable

This is circuit Variable Regulator power supply,Output voltage 0-30V and Current 5A max. Use IC LM723 is a voltage regulator designed primarily for series regulator applications. By itself, it will supply output currents up to 150 mA I so use Transistor 2N3055 X 2 for Booster current to 5A. IC CA3140 for Control Current and Voltage.
P1-50K for control current.
R20-50K for Adjustable voltage output.
R19-5K for fine Adjustable voltage output.
Transformer use 5-8A, Voltage see in circuit.
Detail more see circuit.

PCB
PCB Variable Regulator 0-30V 5A

Friday, October 3, 2014

5 volt and 12 volt Switching Regulator

LM2575 step-down switching regulator Circuirt

LM 2577 Step-up switching regulator Circuit

Switching regulators is available in different circuit configurations including turnaround time, feed-forward, push-pull, and not iso lated a single terminal or one polarity types. In addition, switching regulators can operate in three modes - down, step-up or reverse polarity.

M 2575 a series developed by National Semiconductor regulators are monolithic IC that provide active functions to step down (again) change the regulator can handle the load A1A, with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V and adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed frequency oscillator. LM 2575 series offers high-performance replacement for popular 3 terminal linear regulators. Substantially reduced the size of the heatsink, and in many cases no heat sink is required. Version sets the output voltage is illustrated in Fig.

The National Semiconductor LM 2577 1577/LM are monolithic integrated circuits that provide all the functions of power and control of step-up (boost), fly backward, forward and converter switching regulators. The device is available in three different output voltage: 12 V, 15 V and adjustable.

Saturday, September 20, 2014

Low drop Regulator with Indicator Circuit Diagram

This is an electronic Low-drop Regulator with Indicator Circuit Diagram. Even today much logic is still powered from 5 volts and it then seems obvious to power the circuit using a standard regulator from a rectangular 9-V battery. A disadvantage of this approach is that the capacity of a 9-V battery is rather low and the price is rather high. Even the NiMH revolution, which has resulted in considerably higher capacities of (pen-light) batteries, seems to have escaped the 9-V battery generation. It would be cheaper if 5 volts could be derived from 6 volts, for example. That would be 4 ‘normal’ cells or 5 NiMH- cells. Also the ‘old fashioned’ sealed lead- acid battery would be appropriate, or two lithium cells.

Low-drop Regulator with Indicator Circuit diagram :

Low-drop Regulator with Indicator Circuit Diagram

Using an LP2951, such a power supply is easily realised. The LP2951 is an ever- green from National Semiconductor, which you will have encountered in numerous Elektor Electronics designs already. This IC can deliver a maximum current of 100 mA at an input voltage of greater than 5.4 V. In addition to this particular version, there are also versions available for 3.3 and 3 V output, as well as an adjustable version. In this design we have added a battery indicator, which also protects the battery from too deep a discharge. As soon as the IC has a problem with too low an input voltage, the ERROR output will go low and the regulator is turned off via IC2d, until a manual restart is provided with the RESET pushbutton.

The battery voltage is divided with a few resistors and compared with the reference voltage (1.23 V) of the regulator IC. To adapt the indicator for different voltages you only need to change the 100-k resistor. The comparator is an LP339. This is an energy-friendly version of the LM339. The LP339 consumes only 60 µA and can sink 30 mA at its output. You can also use the LM339, if you happen to have one around, but the current consumption in that case is 14 times higher (which, for that matter, is still less than 1 mA).

Finally, the LP2951 in the idle state, consumes about 100 µA and depend- ing on the output current to be deliv- ered, a little more.

Author : Karel Walraven - Copyright : Elektor

Thursday, September 18, 2014

Charger circuit equipped with a regulator circuit output voltage

The circuit charger is equipped with voltage output settings , so that we can regulate how much voltage to charge the battery. And the settings using the potentio making it easier for us managing voltage up to a mV. See charger circuit below :

Adjust the circuit by setting the 500 Ohm resistor while it is attached to a fully charged battery.

You can use the circuit to charge :
Cells battery
Wet Accu
Dry Accu
Nicad battery
Solar battery

Thursday, September 11, 2014

Overcurrent Trip Regulator Power Supply

Overcurrent Trip Regulator Power Supply Circuit

Available to 4QD-TEC members are rather more sophisticated power supplies: a larger supply of the same nature s this is available, with parts information and board layout. A Circuit board is also likely to be made available in time.

Also in preparation are details of a full laboratory type power supply with fully adjustable current limiting and output voltage. This can be used to make, maybe, 0-50v at 0-5 A, or other ranges as the builder may require.