Project RD15 rf Amplifier Part 1

April 27, 2011, 03:23:07 PM

Membuat layout rd15 seperti ini dengan input c1970

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April 28, 2011, 01:36:14 PM

Jarang meperhatikan inputnya rd15 kok kecil betul…..

Salah baca, waktu itu yang terbaca di UHF sbb mau buat link sehingga yang diingat perlu input 1 sd 3 watt. Cukup dari PLL saja dgn output 0.5W bisa keluar 15watt, tak perlu pakai c1970 segala.

Yups…
Kecil-kecil inputnya

Modifikasi PC power supply 12V menjadi 13.8V

Pilihan modifikasi power supply (ps) switching PC diambil dengan pertimbangan sbb:

  • mudah diperoleh dan berharga relatif murah
  • effisiensi switching yang tinggi
  • ukuran yang lebih kecil dan berat yang lebih ringan bila dibandingkan dengan kemampuan arus yang sama bila menggunakan trafo konvensional

PS yang dapat dimodifikasi pada penjelasan berikut adalah PS yang menggunakan IC TL494 atau K7500 atau yang sejenis sebagai IC smpsnya, walaupun dengan prinsip yang sama dapat diterapkan pada ps yang lain. Buat rekan-rekan amatir radio mungkin ini bisa jadi solusi mur mer untuk rig nya, tidak perlu beli ps yang mahal-mahal.

cara modifikasi:

  • lepaskan ps dari chassing dan pastikan sudah cukup waktu bagi capasitor tegangan tinggi untuk mengosongkan isinya
  • buka penutup chassing PS dan perhatikan chips spms
  • perhatikan resistor2 disekitar pin 1 IC smps, nilai resistor sengaja tidak saya sebutkan karena bisa berbeda antara satu merek dengan yang lainnya
  • lepas resistor yang menghubungkan pin 1 dengan tegangan 5V dan 12V (perhatikan ilustrasi skema berikut)

TL494 feedback

  • resistor yang menghubungkan pin 1 ke ground tidak perlu dilepas.
  • ganti resistor yang menghubungkan pin 1 dan 12V dengan multiturn resistor 50K setelah sebelumnya diatur sehingga memberikan nilai kurang lebih 25K   (pin tengah dihubungkan ke salah satu pin yang dipinggir)

ganti resistor feedback dengan VR multiturn

  • nyalakan ps dan ukur keluaran 12V (kabel berwarna kuning) lalu atur multiturn hingga bacaan tegangan 12V menjadi 13.8V

13.8V dari PC power supply

  • bila diinginkan maka kabel-kabel untuk tegangan lain 3.3V, dan 5V bisa dilepas
  • silahkan  gunakan chasing baru baru bila diinginkan atau bisa ditambakan instrument volt dan ampere meter atau bisa juga ditambahkan LCD dsb.

bentuk akhir bisa ditambahkan LCD untuk bacaan tegangan dan arus

datasheet:
TL494

semoga bermanfaat
Dian Kurniawan

 

Sumber : http://diankurniawan.wordpress.com/2011/05/18/modifikasi-pc-power-supply/

200W ATX PC POWER SUPPLY

Introduction

Here I bring you wiring diagram of PCs power supply of DTK company. This power supply has ATX design and 200W performance. I was drawed diagram, when I repaired this power supply.

Schematics diagram

ATX schema

Circuit description

This power supply circuit uses chip TL494. Similar circuit is used in the most power supplies with output power about 200W. Device use push-pull transistor circuit with regulation of output voltage.

Input part a standby supply

Line voltage goes through input filter circuit (C1, R1, T1, C4, T5) to the bridge rectifier. When voltage is switched from 230V to 115V, then rectifier works like a doubler. Varistors Z1 and Z2 have overvoltage protect function on the line input. Thermistor NTCR1 limits input current until capacitors C5 and C6 are charged. R2 and R3 are only for discharge capacitors after disconnecting power supply. When power supply is connected to the line voltage, then at first are charged capacitors C5 and C6 together for about 300V. Then take a run secondary power supply controlled by transistor Q12 and on his output will be voltage. Behind the voltage regulator IC3 will be voltage 5V, which goes in to the motherboard and it is necessary for turn-on logic and for “Wake on something” functions. Next unstabilized voltage goes through diode D30 to the main control chip IC1 and control transistors Q3 and Q4. When main power supply is running, then this voltage goes from +12V output through diode D.

Stand-By mode

In stand-by mode is main power supply blocked by positive voltage on the PS-ON pin through resistor R23 from secondary power supply. Because of this voltage is opened transistor Q10, which opens Q1, which applies reference voltage +5V from pin 14 IO1 to pin 4 IO1. Switched circuit is totally blocked. Tranzistors Q3 and Q4 are both opened and short-circuit winding of auxiliary transformer T2. Due to short-circuit is no voltage on the power circuit. By voltage on pin 4 we can drive maximum pulse-width on the IO1 output. Zero voltage means the highest pulse-width. +5V means that pulse disappear.

Start of supply

Somebody pushes the power button on computer. Motherboard logic put to ground input pin PS-ON. Transistor Q10 closes and next Q1 closes. Capacitor C15 begins his charging through R15 and on the pin 4 IC1 begins decrease voltage to zero thanks to R17. Due to this voltage is maximum pulse-width continuosly increased and main power supply smoothly goes run.

Normal operation

In a normal operation is power supply controlled by IC1. When transistors Q1 and Q2 are closed, then Q3 and Q4 are opened. When we want to open one from power transistors (Q1, Q2), then we have to close his exciting transistor (Q3, Q4). Current goes via R46 and D14 and one winding T2. This current excite voltage on base of power transistor and due to positive feedback transistor goes quickly to saturation. When the impulse is finished, then both exciting transistors goes to open. Positive feedback dissapears and overshoot on the exciting winding quickly closes power transistor. After it is process repetead with second transistor. Transistors Q1 and Q2 alternately connects one end of primary winding to positive or negative voltage. Power branch goes from emitor of Q1 (collector Q2) through the third winding of exciting transformer T2. Next throug primary winding of main transformer T3 and capacitor C7 to the virtual center of supply voltage.

Output voltage regulation

Output voltages +5V and +12V are measured by R25 and R26 and their output goes to the IC1. Other voltages are not stabilised and they are justified by winding number and diode polarity. On the output is necessary reactance coil due to high frequency interference. This voltage is rated from voltage before coil, pulse-width and duration cycle. On the output behind the rectifier diodes is a common coil for all voltages. When we keep direction of windings and winding number corresponding to output voltages, then coil works like a transformer and we have compensation for irregular load of individual voltages. In a common practise are voltage deviations to 10% from rated value. From the internal 5V reference regulator (pin 14 IC1) goes reference voltage through the voltage divider R24/R19 to inverting input(pin 2) of error amplifier. From the output of power supply comes voltage through divider R25,R26/R20,R21 to the non inverting input (pin 1). Feedback C1, R18 provides stability of regulator. Voltage from error amplifier is compared to the ramp voltage across capacitor C11. When the output voltage is decreased, then voltage on the error amplifier is too decreased. Exciting pulse is longer, power transistors Q1 and Q2 are longer opened, width of pulse before output coil is grater and output power is increased. The second error amplifier is blocked by voltage on the pin 15 IC1.

PowerGood

Mainboard needs “PowerGood” signal. When all output voltages goes to stable, then PowerGood signal goes to +5V (logical one). PowerGood signal is usually connected to the RESET signal.

+3.3V Voltage regulation

Look at circuit connected to output voltage +3.3V. This circuit makes additional voltage stabilisation due to loss of voltage on cables. There are one auxiliary wire from connector for measure 3.3V voltage on motherboard.

Overvoltage circuit

This circuit is composed from Q5, Q6 and many discrete components. Circuit guards all of output voltages and when the some limit is exceeded, power supply is stopped.
For example when I by mistake short-circuit -5V with +5V, then positive voltage goes across D10, R28, D9 to the base Q6. This transistor is now opened and opens Q5. +5V from pin 14 IC1 comes across diode D11 to the pin 4 IC1 and power supply is blocked. Beyond that goes voltage again to base Q6. Power supply is still blocked, until he is disconnected from power line input.

Links

ATX Power Connector

Pin Signal Color 1 Color 2 Pin Signal Color 1 Color 2
1 3.3V orange violet 11 3.3V orange violet
2 3.3V orange violet 12 -12V blue blue
3 GND black black 13 GND black black
4 5V red red 14 PS_ON green grey
5 GND black black 15 GND black black
6 5V red red 16 GND black black
7 GND black black 17 GND black black
8 PW_OK grey orange 18 -5V white white
9 5V_SB violet brown 19 5V red red
10 12V yellow yellow 20 5V red red

Schematic Diagram Power Supply 30 Ampere

SECHEMATIC DIAGRAM POWER SUPPLY 30 AMPERE

26 Mar, 2012
Power Supply 30 Ampere biasanya digunakan oleh teman-teman yang suka berkomunikasi dengan menggunakan radio komunikasi seperti :Rig , HT, Old Band ,juga untuk station pemancar radio,Televisi,dan masih banyak lagi peralatan yang membutuhkan power supply yang Ampernya besar , pa da dasrnya rangkaian yang digunakan sama seperti yang saya sajikan di postingan kali ini, kalau mau menambah Ampernya tinggal diganti sumber tegangan yang Ampernya besar (Trafo). Rangkaian Power Supply ini mem punyai Automatic Protect di IC LM723 ,apa bila DC outputnya konslaiting

atau short dengan negativenya maka DC output automatic kosong (0 V) se hingga tidak akan terjadi kebakaran/kerusakan.untuk membuat rangkaian Power Supply ini memang agak rumit dengan komponennya agak banyak tetapi suku cadang komponen sangat mudah mendapatkannya di toko-toko sparepart komponen elektronik,walaupun buatnya agak rumit tetapi hasilnya di jamin bagus ,DC output murni arus battery ;automatic protect;Amper yang kuat kayaknya kok terlalu panjang ya ulasan saya , wah ya maaf teman-teman me mang supaya ada gambaran buat teman-teman ,kalau begitu mari kita lihat Sechematic Power Supply 30 Ampere berikut ini :
Power Supply 30 Ampere

Sechematic diagram Power Supply ini saya gambar sendiri dengan menggunakan program Eagle design PCB , untuk jenis komponen dan keterangan satuan uku ran yang dibutuhkan sudah tertera di sechematic itu untuk memudahkan teman- teman yang membacanya. Demikian yang sederhana ini semoga ada manfaatnya akhirnya sekian dulu postingan kali ini ada kurangnya saya mohon  maaf yang sebesar-besarnya ,kalau ada saran maupun kritik dari teman-teman alangkah senangnya saya demi untuk perbaikan dan dipersilahkan isi komentar.  Salam Blogger dan terbaik untuk semuanya.
Posting By M.E.Service Via Blogger.com
Sumber : http://meservice.blogspot.com/2012/03/sechematic-diagram-power-supply-30.html#.UUK3ljc823g

12V 15A voltage regulator

Description.
Here is the circuit diagram of a powerful 12V regulator that can deliver up to 15 A of current.The common voltage regulator IC 7812(IC1) is used to keep the voltage at steady 12V and three TIP 2599 power transistors in parallel are wired in series pass mode to boost the output current. The 7812 can provide only up to 1A and rest of the current is supplied by the series pass transistors. The 15A bridge B1 does the job of rectifying the stepped down AC input. The capacitor C1, C2 and C3 act as filters. The 1A fuse F1 protects the IC1 from over current in case if the pass transistors fail. The 15A fuse F2 protects the entire circuit (especially the pass transistors) from over current.

With high current transformer, power transistors and high current bridge the circuit is a bit costly and you may try this only if there is a serious need.

Circuit diagram with Parts list.

12v-15a-voltage-regulator-_circuit

Notes.

  • Assemble the circuit on a good quality PCB.
  • The T1 can be a 230V AC primary, 18V secondary, 15A type transformer.
  • The B1 can be a 15A bridge.
  • If 15A Bridge is not available, make one using four RURG1520CC diodes.
  • The IC1 and transistors must be mounted on heat sinks.

Sumber : http://www.circuitstoday.com/12v-15a-voltage-regulator

0-28V 6-8A Power Supply (LM317, 2N3055)

This is an easy to make power supply which has stable, clean and regulator 0-28V 6/8 Amp output voltage. By using two 2N3055 transistors we become more then 2 times the amount of amps then the power supply delivers, making it real though to brake ;). Although you could use this design to deliver 20 amps (with almost no modifications and with a proper transformer and a huge heat sink with a fan), I did not needed such much power. Make sure you mount them on a huge heat sink, as the 2N3055 transistors can get very hot at full load.

0-28V 6-8A  Power Supply (LM317, 2N3055)

Although the LM-317 power regulator will kick in on shortcircuit, overload and thermal overheating, the fuses in the primary section of the transformer and the fuse F2 at the output will secure your power supply. The rectified voltage of: 30 volt x SQR2 = 30 x 1.41 = 42.30 volt measured on C1. So all capacitors should be rated at 50 volts. Caution: 42 volt is the voltage that could be on the output if one of the transistors should blow.

P1 allows you to ‘regulate’ the output voltage to anything between 0 and 28 volts. The LM317 lowest voltage is 1.2 volt. To have a zero voltage on the output I’ve put 3 diodes D7,D8 and D9 on the output of the LM317 to the base of the 2N3055 transistors. The LM317 maximum output voltage is 30 volts, but using the diodes D7,D8 & D9 the output voltage is approx 30v – (3x 0.6v) = 28.2volt.

Calibrate your build-in voltmeter using P3 and, of course, a good digital voltmeter.

P2 will allow you to set the limit of the maximum available amps at the output +Vcc. When using a 100 Ohm/1watt varistat the current is limited to approx. 3 Amps @ 47 Ohm and +- 1 Amp @ 100 Ohms.

Note:
The collectors of the finals needs to be soldered with a wire all together if the transistors even if they are isolated from the heatsink or not. If you do not isolated the finals from the heatsink, then please make sure the heatsink does not make contact with the chassis (metal casing where you plan to build the PS into).
Remember to use thick wires suitable for transfering the current needed according to the power supply you tend to build.

Part list for 6/8 Amp regulatable power supply (PSR28A68):

2 x 15 volt (30volt total) 6+- amps

D1…D4 = four MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 x 4 1N5401 (1N5408) diodes.

F1 = 1 Amp

F2 = 10 amp

R1 2k2 2,5 Watt

R2 240 ohm

R3,R4 0.1 ohm 10 watt

R7 6k8

R8 10k

R9 47 0.5 watt

R10 8k2

C1,C7,C9 47nF

C11 22nF

C2 two times 4700uF/50v

C3,C5 10uF/50v

C4,C6 100nF

C8 330uF/50v

C10 1uF/16v

D5 1N4148, 1N4448, 1N4151

D6 1N4001

D10 1N5401

D11 LED

D7, D8, D9 1N4001

IC1 LM317

Two 2N3055 transistors

P1 5k

P2 47 Ohm or 220 Ohm 1 watt * (be sure you can reach 0 ohms as any resistance limits the current)

P3 10k trimmer
Calibration:
– Get your hands on a calibrated digital meter or a good analog meter and measure the voltage at the output of the power supply.
– Turn P1 to maximum (maximum voltage of our power supply).
– Adjust P3 till the meter needle shows maximum result (end scale)
– If you want to calibrate the scale, turn P1 to several voltages (like every volt) and confirm each time with your calibrated voltage meter. Make a mark on your power supply meter-scale to calibrate the meter.
– You should see equal spaced voltage marks on your home-made scale if your meter is a linear type.

Less maximum output voltage needed?
In operation, the LM317 develops a nominal 1.25V reference voltage, VREF, between the output and adjustment terminal.
The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I1 then flows through the output set resistor R2, giving an
output voltage of

Since the 100 uA current from the adjustment terminal represents an error term, the LM317 was designed to minimize IADJ and make it very constant with line and load changes.
To do this, all quiescent operating current is returned to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output will rise.

Less amps needed?
Well, without much modification you can:
– only one 2N3055, will give you 4…5 amps.
– the bridge rectifier (D1…D4) only needs 4 x 1N5401 (any +/- 3 amp diodes as only halve of the max. amp is needed, so we have some room when short-circuited)
– one 4700uF (C2) is sufficient
– F2 = 6 amp
– D5, D10 = 1N4001

The power supply insides

Heat sink
Remember to isolate the transistors from the chassis/radiator! Use a radiator (heat sink) of appropriate size and surface area; insulating and heat-conducting spacer or at least a thin mica; hot adhesive and thermal paste.

Finished power supply:
Note: You can add a 3th 2N3055 and use for R9=27 Ohm, to make a 10/12 ampere power supply of the design stated above.

Sumber : http://electronics-diy.com/power-supply-lm317-2n3055-0-28v-6-8a.php

Regulator 12V 10A by IC 723+2N3055

This is circuit regulator 12V 10A by IC 723+2N3055.
Q 2N3055 x 2 for to increase form IC LM723.
To use transformer 10A, Transistor to Hold Heatsink.
To adjust the output voltage simplyt by VR1 – 1K.

regulator-12v-10a-by-ic-723-2n3055
circuit Regulator 12V 10A by IC 723+2N3055

A friend of me wants 12V Power supply for High Current 10A load. Me tries to search see meet this circuit will should is appropriate. Because of use IC LM723. Be the integrated circuit Voltage Regulator at good one although older already. But still be usable well. Fine decorate voltage output with well. Besides still have the transistor 2N3055 numbers are highly popular transistor again the one number. Make the all equipment of this circuit seeks easy certainly. If friends want to give 10A electric tall currents. Should use a pot transforms the sky that has 10A sizes with. For VR1 give for fine decorate voltage output get as well be can fine about 0-16V. The detail is other , please see in the circuit better.

PCB of Regulator 12V 10A by IC 723+2N3055
PCB Regulator 12V 10A by IC 723+2N3055

sumber : http://www.eleccircuit.com/regulator-12v-10a-by-ic-7232n3055/

Build an Adjustable 0-34 volt power supply with the LM317

LM317 power supply

Build an Adjustable 0-34 volt power supply with the LM317

by Lewis Loflin

The LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It is exceptionally easy to use and requires only two external resistors to set the output voltage. Furthermore, both line and load regulation are better than standard fixed regulators.

By using a heat-sinked pass transistor such as a 2N3055 (Q1) we can produce several amps of current far above the 1.5 amps of the LM317. Please note that at low output voltages at high current Q1 can get very hot.

Circuit Operation

L1 is a 120 to 24 volt transformer. The one I used was rated for 25.2 volts RMS at 3 amps from Radio Shack. Diode bridge D1 should also be rated at 3 amps or greater and at least 50 PIV or greater. D1 could also be four 3 amp diodes. C2 is a 3300 uF 50 volt electrolytic that will charge up to almost 40 volts with a 25.2 volts. (1.414 * 24.5 volts RMS)

R2 is a 220 ohm half watt and R1 is a 10,000 ohm potentiometer. This is ueed to set the output voltage of the LM317. C1 is a 10-22 uF electrolytic while Q1 can be a TIP41 (TO-220 case) or 2N3055 (TO-3 case).

Pin diagram LM317

This LM338T voltage regulator chip (aka LM338) works in exactly the same way as the LM317T voltage regulator, the only difference being it can deal with higher currents. The LM338T is rated at 5 Amps continuous current. Used with a suitable heat sink the LM338 will produce continuous currents of up to 8 Amps.

In all cases VOUT = 1.25 * ( 1 + R2/R1 )

transistor pin diagrams
General transistor pin connections.

sumber : http://www.bristolwatch.com/ele/lm317.htm

Regulator Simetris

Satu lagi yang terlewat regulator simetris

catu-daya-simetris

Regulator 7812 dan sejenisnya

He he …. yang dibahas yang besar besar amperenya, kelupaan regulator 78xx belum dicantumkan, simpel untuk ampere kecil saja.

ic-regulator circuit_regulator_for_78xx