Electronic Components » Voltage Regulators


LM2596 DC Converter Adjustable Power Module Regulator
LM2596 DC Converter Adjustable Power Module Regulator
$3.99
LM2596 DC Converter Adjustable Power Module Regulator
7805 7809 7812 7905 7909 7912 Regulator with Heatsink
7805 7809 7812 7905 7909 7912 Regulator with Heatsink
$4.99
7805 7809 7812 7905 7909 7912 Regulator with Heatsink
QUANTITY 10,  National  LM340KC -5.0  IC NEW NEW NEW
QUANTITY 10, National LM340KC -5.0 IC NEW NEW NEW
$40.00
QUANTITY 10, National LM340KC -5.0 IC NEW NEW NEW
QUANTITY 10,    National LM350K IC  NEW NEW  NEW
QUANTITY 10, National LM350K IC NEW NEW NEW
$40.00
QUANTITY 10, National LM350K IC NEW NEW NEW
Power MOSFET IRFP460 20A 500V  235W 60pF Fast DMOS  (x4
Power MOSFET IRFP460 20A 500V 235W 60pF Fast DMOS (x4
$8.55
Power MOSFET IRFP460 20A 500V 235W 60pF Fast DMOS (x4
Power MOSFET IRFP460 20A 500V  235W 60pF Fast DMOS  (x4
Power MOSFET IRFP460 20A 500V 235W 60pF Fast DMOS (x4
$8.55
Power MOSFET IRFP460 20A 500V 235W 60pF Fast DMOS (x4
4 PCS LM317T Variable Voltage Regulators 1.2v - 37v
4 PCS LM317T Variable Voltage Regulators 1.2v - 37v
$2.00
4 PCS LM317T Variable Voltage Regulators 1.2v - 37v
10 pcs,  3.0 Amp Positive Voltage Regulator 1.5V
10 pcs, 3.0 Amp Positive Voltage Regulator 1.5V
$3.75
10 pcs, 3.0 Amp Positive Voltage Regulator 1.5V
10 pcs,  2.0 Amp Positive Voltage Regulator 2.5V
10 pcs, 2.0 Amp Positive Voltage Regulator 2.5V
$3.75
10 pcs, 2.0 Amp Positive Voltage Regulator 2.5V
LM323T Positive 3A 5V Voltage Regulator  LOT OF 20
LM323T Positive 3A 5V Voltage Regulator LOT OF 20
$20.00
LM323T Positive 3A 5V Voltage Regulator LOT OF 20
LM323K Positive 3A 5V Voltage Regulator  LOT OF 10
LM323K Positive 3A 5V Voltage Regulator LOT OF 10
$18.00
LM323K Positive 3A 5V Voltage Regulator LOT OF 10
5 pcs. TL431ACL TL431 PRECISION SHUNT REGULATOR - TEXAS
5 pcs. TL431ACL TL431 PRECISION SHUNT REGULATOR - TEXAS
$1.00
5 pcs. TL431ACL TL431 PRECISION SHUNT REGULATOR - TEXAS
APC LE1200 1200VA Voltage Regulator *NEW*
APC LE1200 1200VA Voltage Regulator *NEW*
$77.56
APC LE1200 1200VA Voltage Regulator *NEW*
Regulator Power Supply Module AC-DC 0-30V 1A
Regulator Power Supply Module AC-DC 0-30V 1A
$9.50
Regulator Power Supply Module AC-DC 0-30V 1A
25 L7808ACV   L-7808 +8.0V, 1.5A VOLTAGE REGULATORs, 8VDC
25 L7808ACV L-7808 +8.0V, 1.5A VOLTAGE REGULATORs, 8VDC
$19.95
25 L7808ACV L-7808 +8.0V, 1.5A VOLTAGE REGULATORs, 8VDC
10 pcs,  3.0 Amp Positive Adjustable Voltage Regulator
10 pcs, 3.0 Amp Positive Adjustable Voltage Regulator
$3.75
10 pcs, 3.0 Amp Positive Adjustable Voltage Regulator
10 pcs,  1.5 Amp Positive Adjustable Voltage Regulator
10 pcs, 1.5 Amp Positive Adjustable Voltage Regulator
$3.75
10 pcs, 1.5 Amp Positive Adjustable Voltage Regulator
Regulator Power Supply DC 1.5, 3, 5, 6, 9, 12V 3A Module
Regulator Power Supply DC 1.5, 3, 5, 6, 9, 12V 3A Module
$10.00
Regulator Power Supply DC 1.5, 3, 5, 6, 9, 12V 3A Module
DC24V to DC12V Step-down Converter (In 24V Out 12V 15A)
DC24V to DC12V Step-down Converter (In 24V Out 12V 15A)
$32.00
DC24V to DC12V Step-down Converter (In 24V Out 12V 15A)
LM350T,  3 Amp Adjustable Voltage (Reg) Regulator Qty 40
LM350T, 3 Amp Adjustable Voltage (Reg) Regulator Qty 40
$42.99
LM350T, 3 Amp Adjustable Voltage (Reg) Regulator Qty 40
NATIONAL IC VOLTAGE REGULATOR LM2585T 3A TO-220-5 (1pc)
NATIONAL IC VOLTAGE REGULATOR LM2585T 3A TO-220-5 (1pc)
$6.99
NATIONAL IC VOLTAGE REGULATOR LM2585T 3A TO-220-5 (1pc)
100 pcs 2SA1015 2SA1015Y PNP General Transistor Toshiba
100 pcs 2SA1015 2SA1015Y PNP General Transistor Toshiba
$3.59
100 pcs 2SA1015 2SA1015Y PNP General Transistor Toshiba
50 pcs 2SA1015 2SA1015Y PNP General Transistor Toshiba
50 pcs 2SA1015 2SA1015Y PNP General Transistor Toshiba
$1.99
50 pcs 2SA1015 2SA1015Y PNP General Transistor Toshiba
SG Frantz Electromagnetic separator Rectifier S-3B 115
SG Frantz Electromagnetic separator Rectifier S-3B 115
$75.00
SG Frantz Electromagnetic separator Rectifier S-3B 115
Lot of 7 MegaMod Jr. DC power Converters 6 new 1 used
Lot of 7 MegaMod Jr. DC power Converters 6 new 1 used
$99.99
Lot of 7 MegaMod Jr. DC power Converters 6 new 1 used
10 pcs,  3.0 Amp Positive Voltage Regulator 1.5V
10 pcs, 3.0 Amp Positive Voltage Regulator 1.5V
$3.75
10 pcs, 3.0 Amp Positive Voltage Regulator 1.5V
10 pcs,  SIMPLE SWITCHER® 1A Step-Down Voltage Regulator
10 pcs, SIMPLE SWITCHER® 1A Step-Down Voltage Regulator
$4.75
10 pcs, SIMPLE SWITCHER® 1A Step-Down Voltage Regulator
In 5-40V Out 12-50V Adjustable DC-DC Step-up Converter
In 5-40V Out 12-50V Adjustable DC-DC Step-up Converter
$20.00
In 5-40V Out 12-50V Adjustable DC-DC Step-up Converter
78L05Z 78L05 100mA 5V Voltage Regulator Positive (50)
78L05Z 78L05 100mA 5V Voltage Regulator Positive (50)
$5.29
78L05Z 78L05 100mA 5V Voltage Regulator Positive (50)
LM350 LM350T Adjustable Voltage Regulator 1.2 - 33V 3A
LM350 LM350T Adjustable Voltage Regulator 1.2 - 33V 3A
$1.20
LM350 LM350T Adjustable Voltage Regulator 1.2 - 33V 3A
LM338K LM338 Adj. Voltage Regulator 5A "SGS-THOMSON"
LM338K LM338 Adj. Voltage Regulator 5A "SGS-THOMSON"
$4.40
LM338K LM338 Adj. Voltage Regulator 5A "SGS-THOMSON"
MARATHON SE-350 GENERATOR VOLTAGE REGULATOR AVR ONAN
MARATHON SE-350 GENERATOR VOLTAGE REGULATOR AVR ONAN
$189.99
MARATHON SE-350 GENERATOR VOLTAGE REGULATOR AVR ONAN
SX440 NEWAGE GENERATOR VOLTAGE REGULATOR ONAN 305-0824
SX440 NEWAGE GENERATOR VOLTAGE REGULATOR ONAN 305-0824
$199.99
SX440 NEWAGE GENERATOR VOLTAGE REGULATOR ONAN 305-0824
Motorola MC7812CT,  7812,  L7812C,  MC7812  12V Qty 30
Motorola MC7812CT, 7812, L7812C, MC7812 12V Qty 30
$7.00
Motorola MC7812CT, 7812, L7812C, MC7812 12V Qty 30
Mallory MR10KB   MR10KT Wirewound Controls Brand NEW!!
Mallory MR10KB MR10KT Wirewound Controls Brand NEW!!
$125.00
Mallory MR10KB MR10KT Wirewound Controls Brand NEW!!
National Semi LM305H IC VREG POS 30MA ADJ TO-5 NEW!!
National Semi LM305H IC VREG POS 30MA ADJ TO-5 NEW!!
$5.00
National Semi LM305H IC VREG POS 30MA ADJ TO-5 NEW!!
ST Micro 2N3440 TRANSISTOR NPN 300V 1A TO-39 NEW!!
ST Micro 2N3440 TRANSISTOR NPN 300V 1A TO-39 NEW!!
$7.50
ST Micro 2N3440 TRANSISTOR NPN 300V 1A TO-39 NEW!!
Siemon S110C-3 3-pair Connecting Block 10 pack NEW
Siemon S110C-3 3-pair Connecting Block 10 pack NEW
$10.00
Siemon S110C-3 3-pair Connecting Block 10 pack NEW
Supertex HT0638LG Electronic Line Switch
Supertex HT0638LG Electronic Line Switch
$7.50
Supertex HT0638LG Electronic Line Switch
Supertex HT19LG Electyronic Telephone Line Switch
Supertex HT19LG Electyronic Telephone Line Switch
$5.00
Supertex HT19LG Electyronic Telephone Line Switch
ALCO switch MTA 106D - Pre-Prepped but unused
ALCO switch MTA 106D - Pre-Prepped but unused
$2.00
ALCO switch MTA 106D - Pre-Prepped but unused
LM309H IC REGULATOR 5V TO-39 -   NEW & UNUSED!
LM309H IC REGULATOR 5V TO-39 - NEW & UNUSED!
$7.00
LM309H IC REGULATOR 5V TO-39 - NEW & UNUSED!
LT1019AMH-2.5 IC PREC REF 2.5V .05% TOL  NEW & UNUSED!
LT1019AMH-2.5 IC PREC REF 2.5V .05% TOL NEW & UNUSED!
$5.75
LT1019AMH-2.5 IC PREC REF 2.5V .05% TOL NEW & UNUSED!
LM311H  IC VOLTAGE COMPARATOR TO-99-8- NEW & UNUSED!
LM311H IC VOLTAGE COMPARATOR TO-99-8- NEW & UNUSED!
$5.25
LM311H IC VOLTAGE COMPARATOR TO-99-8- NEW & UNUSED!
DC-to-DC Converter 100W 48V to 3.3V,  12V,  12V Very Nice
DC-to-DC Converter 100W 48V to 3.3V, 12V, 12V Very Nice
$33.00
DC-to-DC Converter 100W 48V to 3.3V, 12V, 12V Very Nice
6.0v-8.4v DC to DC 5v 1Amp Volt Regulator   RCB-DCDC002
6.0v-8.4v DC to DC 5v 1Amp Volt Regulator RCB-DCDC002
$12.95
6.0v-8.4v DC to DC 5v 1Amp Volt Regulator RCB-DCDC002
6v-10v DC to DC 6v 5Amp Voltage Regulator   DC610T65A
6v-10v DC to DC 6v 5Amp Voltage Regulator DC610T65A
$17.95
6v-10v DC to DC 6v 5Amp Voltage Regulator DC610T65A
16v-25.9v DC to DC 19v 4Amp Regulator   RCB-DCDC005
16v-25.9v DC to DC 19v 4Amp Regulator RCB-DCDC005
$19.95
16v-25.9v DC to DC 19v 4Amp Regulator RCB-DCDC005
12v-16.8v DC to DC 12v-13.2v Selectable 4Amp Regulator
12v-16.8v DC to DC 12v-13.2v Selectable 4Amp Regulator
$19.95
12v-16.8v DC to DC 12v-13.2v Selectable 4Amp Regulator
Square D  Surgelogic TVS2-EMA12A  120 208y 3 phase 4w
Square D Surgelogic TVS2-EMA12A 120 208y 3 phase 4w
$650.00
Square D Surgelogic TVS2-EMA12A 120 208y 3 phase 4w
10pcs,  4.6 Amp Positive Voltage Regulator 3.45V
10pcs, 4.6 Amp Positive Voltage Regulator 3.45V
$3.75
10pcs, 4.6 Amp Positive Voltage Regulator 3.45V
DC-to-DC Converter 100W 48V to 5V Lucent LOT of 3
DC-to-DC Converter 100W 48V to 5V Lucent LOT of 3
$24.95
DC-to-DC Converter 100W 48V to 5V Lucent LOT of 3
DC-to-DC Converter 100W 48V to 5V Lucent
DC-to-DC Converter 100W 48V to 5V Lucent
$9.50
DC-to-DC Converter 100W 48V to 5V Lucent
Power Trends PT78ST106-H Converter Voltage Regulator 6V
Power Trends PT78ST106-H Converter Voltage Regulator 6V
$12.95
Power Trends PT78ST106-H Converter Voltage Regulator 6V
New Samlex DC-DC Isolated Industrial Converter
New Samlex DC-DC Isolated Industrial Converter
$9.99
New Samlex DC-DC Isolated Industrial Converter
MX321 NEWAGE GENERATOR VOLTAGE REGULATOR ONAN 305-0823
MX321 NEWAGE GENERATOR VOLTAGE REGULATOR ONAN 305-0823
$499.99
MX321 NEWAGE GENERATOR VOLTAGE REGULATOR ONAN 305-0823
LT1085CT 3A 3 Amp Voltage Regulator Adjustable (4) LOT
LT1085CT 3A 3 Amp Voltage Regulator Adjustable (4) LOT
$9.99
LT1085CT 3A 3 Amp Voltage Regulator Adjustable (4) LOT
LP2950L-5.0 LP2950 5V Voltage Regulator LDO (20) LOT
LP2950L-5.0 LP2950 5V Voltage Regulator LDO (20) LOT
$9.99
LP2950L-5.0 LP2950 5V Voltage Regulator LDO (20) LOT
LP2950L-3.3 LP2950 100mA 3.3V Voltage Regulator (20 LOT
LP2950L-3.3 LP2950 100mA 3.3V Voltage Regulator (20 LOT
$9.99
LP2950L-3.3 LP2950 100mA 3.3V Voltage Regulator (20 LOT
LM337T LM337 T 1.5A Voltage Regulator Adjustable (20
LM337T LM337 T 1.5A Voltage Regulator Adjustable (20
$8.19
LM337T LM337 T 1.5A Voltage Regulator Adjustable (20
LM317MDT LM317 MDT Voltage Regulator Adjustable SMT (20
LM317MDT LM317 MDT Voltage Regulator Adjustable SMT (20
$8.89
LM317MDT LM317 MDT Voltage Regulator Adjustable SMT (20
LM1117T-2.5 LM1117T Voltage Regulator Low Drop-Out (5)
LM1117T-2.5 LM1117T Voltage Regulator Low Drop-Out (5)
$6.69
LM1117T-2.5 LM1117T Voltage Regulator Low Drop-Out (5)
78L08 Voltage Regulator Positive 8V 100mA TO92 (25) LOT
78L08 Voltage Regulator Positive 8V 100mA TO92 (25) LOT
$4.89
78L08 Voltage Regulator Positive 8V 100mA TO92 (25) LOT
30x L78L33ACZ 78L33 3.3V Voltage Regulator TO 92 SGS ST
30x L78L33ACZ 78L33 3.3V Voltage Regulator TO 92 SGS ST
$5.99
30x L78L33ACZ 78L33 3.3V Voltage Regulator TO 92 SGS ST
10 pcs. 78L05 POSITIVE VOLTAGE REGULATOR +5 VOLTS 100mA
10 pcs. 78L05 POSITIVE VOLTAGE REGULATOR +5 VOLTS 100mA
$1.00
10 pcs. 78L05 POSITIVE VOLTAGE REGULATOR +5 VOLTS 100mA
10 pcs. L78L05ACZ L78L05 78L05 +5 VOLTS 100mA Volt Reg
10 pcs. L78L05ACZ L78L05 78L05 +5 VOLTS 100mA Volt Reg
$1.00
10 pcs. L78L05ACZ L78L05 78L05 +5 VOLTS 100mA Volt Reg
MC78L12ACD 78L12 100mA 12V Voltage Regulator Pos (20)
MC78L12ACD 78L12 100mA 12V Voltage Regulator Pos (20)
$6.89
MC78L12ACD 78L12 100mA 12V Voltage Regulator Pos (20)
LM340T-5 5V 1.5A Voltage Regulator Positive (20) LOT
LM340T-5 5V 1.5A Voltage Regulator Positive (20) LOT
$8.89
LM340T-5 5V 1.5A Voltage Regulator Positive (20) LOT
LM34080IM3-3.3 Voltage Regulator Quasi Low Drop-Out (20
LM34080IM3-3.3 Voltage Regulator Quasi Low Drop-Out (20
$9.99
LM34080IM3-3.3 Voltage Regulator Quasi Low Drop-Out (20
LM105H LM105 H Voltage Regulator (1)
LM105H LM105 H Voltage Regulator (1)
$11.29
LM105H LM105 H Voltage Regulator (1)
L78L08ABD 78L08 100mA 8V Voltage Regulator Pos (20) NEW
L78L08ABD 78L08 100mA 8V Voltage Regulator Pos (20) NEW
$7.49
L78L08ABD 78L08 100mA 8V Voltage Regulator Pos (20) NEW
79L24AC 79L24 AC 100mA 24V Voltage Regulator Neg (50)
79L24AC 79L24 AC 100mA 24V Voltage Regulator Neg (50)
$6.89
79L24AC 79L24 AC 100mA 24V Voltage Regulator Neg (50)
78L18AC 78L18 AC 100mA 18V Voltage Regulator Pos (100)
78L18AC 78L18 AC 100mA 18V Voltage Regulator Pos (100)
$7.39
78L18AC 78L18 AC 100mA 18V Voltage Regulator Pos (100)
78L12ACD 78L12 ACD 100mA 12V Voltage Regulator SMT (20)
78L12ACD 78L12 ACD 100mA 12V Voltage Regulator SMT (20)
$6.89
78L12ACD 78L12 ACD 100mA 12V Voltage Regulator SMT (20)
78L12 100mA 12V Voltage Regulator Positive TO92 (50)
78L12 100mA 12V Voltage Regulator Positive TO92 (50)
$9.99
78L12 100mA 12V Voltage Regulator Positive TO92 (50)
78L05ACD 78L05 ACD Voltage Regulator Positive (25) LOT
78L05ACD 78L05 ACD Voltage Regulator Positive (25) LOT
$6.49
78L05ACD 78L05 ACD Voltage Regulator Positive (25) LOT
7815 1A 1 Amp 15V Voltage Regulator Positive (10) LOT
7815 1A 1 Amp 15V Voltage Regulator Positive (10) LOT
$5.89
7815 1A 1 Amp 15V Voltage Regulator Positive (10) LOT
7805 1.5A 1.5 Amp 5V Voltage Regulator TO-3 Military (3
7805 1.5A 1.5 Amp 5V Voltage Regulator TO-3 Military (3
$9.89
7805 1.5A 1.5 Amp 5V Voltage Regulator TO-3 Military (3
AC Power Adapter Charger Supply AC 110V-240V DC 5V 2A
AC Power Adapter Charger Supply AC 110V-240V DC 5V 2A
$5.99
AC Power Adapter Charger Supply AC 110V-240V DC 5V 2A
LM350 LM350T Adjustable Voltage Regulator 1.2 - 33V 3A
LM350 LM350T Adjustable Voltage Regulator 1.2 - 33V 3A
$1.30
LM350 LM350T Adjustable Voltage Regulator 1.2 - 33V 3A
LM323K LM323 Voltage Regulator 5V 3A "SGS-THOMSON"
LM323K LM323 Voltage Regulator 5V 3A "SGS-THOMSON"
$4.49
LM323K LM323 Voltage Regulator 5V 3A "SGS-THOMSON"
GOLDSOURCE AUTOMATIC VOLTAGE REGULATOR MODEL SVL-2000W
GOLDSOURCE AUTOMATIC VOLTAGE REGULATOR MODEL SVL-2000W
$149.99
GOLDSOURCE AUTOMATIC VOLTAGE REGULATOR MODEL SVL-2000W
10 pcs,  3.0 Amp Positive Voltage Regulator 1.5V
10 pcs, 3.0 Amp Positive Voltage Regulator 1.5V
$3.75
10 pcs, 3.0 Amp Positive Voltage Regulator 1.5V
10 pcs. L7905CV L7905 7905 Voltage Regulator - 5V 1.5A
10 pcs. L7905CV L7905 7905 Voltage Regulator - 5V 1.5A
$2.70
10 pcs. L7905CV L7905 7905 Voltage Regulator - 5V 1.5A
10 pcs. L7818CV L7818 7818 Voltage Regulator +18V 1.5A
10 pcs. L7818CV L7818 7818 Voltage Regulator +18V 1.5A
$2.60
10 pcs. L7818CV L7818 7818 Voltage Regulator +18V 1.5A
LM323K LM323 Voltage Regulator 5V 3A "SGS-THOMSON"
LM323K LM323 Voltage Regulator 5V 3A "SGS-THOMSON"
$4.40
LM323K LM323 Voltage Regulator 5V 3A "SGS-THOMSON"
Power Supply DC OR AC - DC 5V Converter
Power Supply DC OR AC - DC 5V Converter
$5.99
Power Supply DC OR AC - DC 5V Converter
LM317 In DC or AC 4V-30V Out DC 1.5V-27V 1A Converter
LM317 In DC or AC 4V-30V Out DC 1.5V-27V 1A Converter
$7.99
LM317 In DC or AC 4V-30V Out DC 1.5V-27V 1A Converter
DC-DC Converter Isolated Power In 10V-16V Double Out 5V
DC-DC Converter Isolated Power In 10V-16V Double Out 5V
$14.99
DC-DC Converter Isolated Power In 10V-16V Double Out 5V
Power Supply DC OR AC - DC 12V Converter
Power Supply DC OR AC - DC 12V Converter
$5.99
Power Supply DC OR AC - DC 12V Converter
Sanken STR-F6519 Switching Voltage Regulator STR-F6600
Sanken STR-F6519 Switching Voltage Regulator STR-F6600
$2.95
Sanken STR-F6519 Switching Voltage Regulator STR-F6600
DC-DC Converter Isolated Power Supply In10V-16V Out 12V
DC-DC Converter Isolated Power Supply In10V-16V Out 12V
$9.99
DC-DC Converter Isolated Power Supply In10V-16V Out 12V
DC-DC Converter Isolated Power Supply In10V-16V Out 5V
DC-DC Converter Isolated Power Supply In10V-16V Out 5V
$9.99
DC-DC Converter Isolated Power Supply In10V-16V Out 5V
DC-DC Converter Isolated Power In10V-16V Double Out 12V
DC-DC Converter Isolated Power In10V-16V Double Out 12V
$14.99
DC-DC Converter Isolated Power In10V-16V Double Out 12V
Step UP DC Converter Regulator Adjustable Charge Laptop
Step UP DC Converter Regulator Adjustable Charge Laptop
$3.99
Step UP DC Converter Regulator Adjustable Charge Laptop
10 pcs,  SIMPLE SWITCHER® 1A Step-Down Voltage Regulator
10 pcs, SIMPLE SWITCHER® 1A Step-Down Voltage Regulator
$4.75
10 pcs, SIMPLE SWITCHER® 1A Step-Down Voltage Regulator
10 pcs,  3.0 Amp Positive Adjustable Voltage Regulator
10 pcs, 3.0 Amp Positive Adjustable Voltage Regulator
$3.75
10 pcs, 3.0 Amp Positive Adjustable Voltage Regulator
10 pcs,  7.0 Amp Positive Adjustable Voltage Regulator
10 pcs, 7.0 Amp Positive Adjustable Voltage Regulator
$3.75
10 pcs, 7.0 Amp Positive Adjustable Voltage Regulator
10 pcs,  1.5 Amp Positive Adjustable Voltage Regulator
10 pcs, 1.5 Amp Positive Adjustable Voltage Regulator
$3.75
10 pcs, 1.5 Amp Positive Adjustable Voltage Regulator
10 pcs,  2.0 Amp Positive Voltage Regulator 2.5V
10 pcs, 2.0 Amp Positive Voltage Regulator 2.5V
$3.75
10 pcs, 2.0 Amp Positive Voltage Regulator 2.5V