Jun 7, 2005 #1 X xxtigerxx Advanced Member level 1 Joined Jun 5, 2001 Messages 441 Helped 38 Reputation 76 Reaction score 32 Trophy points 1,308 Location Greece Activity points 2,890 i want to produce -5Volts and i have only ground and 5Volts.. THX.........
Jun 7, 2005 #2 I instruite Advanced Member level 4 Joined Jun 7, 2005 Messages 112 Helped 9 Reputation 18 Reaction score 4 Trophy points 1,298 Location India/Japan Activity points 2,555 What is the load where you want to connect -5V? Instruite =============== Ideas that work, Concepts that sell. ===============
What is the load where you want to connect -5V? Instruite =============== Ideas that work, Concepts that sell. ===============
Jun 7, 2005 #3 I IanP Advanced Member level 7 Joined Oct 5, 2004 Messages 7,929 Helped 2,311 Reputation 4,624 Reaction score 531 Trophy points 1,393 Location West Coast Activity points 66,416 For small currents (<300mA) you can use simple circuit based on 555 timer: https://www.aaroncake.net/circuits/vinvertr.htm Regards, IanP
For small currents (<300mA) you can use simple circuit based on 555 timer: https://www.aaroncake.net/circuits/vinvertr.htm Regards, IanP
Jun 7, 2005 #4 X xxtigerxx Advanced Member level 1 Joined Jun 5, 2001 Messages 441 Helped 38 Reputation 76 Reaction score 32 Trophy points 1,308 Location Greece Activity points 2,890 the load is 20mA...
Jun 7, 2005 #5 snoopy Member level 1 Joined Sep 14, 2004 Messages 32 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,286 Activity points 273 You can use also ICL7660 voltage inverter. **broken link removed** Bojan
Jun 7, 2005 #6 V vdaniel Full Member level 4 Joined Oct 8, 2004 Messages 204 Helped 8 Reputation 16 Reaction score 0 Trophy points 1,296 Activity points 2,157 If -4.1V is enough, then I highly recommend to use the Linear Techolology's LTC1550L, because it makes practically no noise. Varuzhan
If -4.1V is enough, then I highly recommend to use the Linear Techolology's LTC1550L, because it makes practically no noise. Varuzhan
Jun 8, 2005 #7 R rhesusmonkeyboy Newbie level 5 Joined Jun 1, 2005 Messages 8 Helped 2 Reputation 4 Reaction score 0 Trophy points 1,281 Activity points 1,394 You need an inverting buck-boost, which is an "easy" switched-mode power supply circuit, in its simplest form. It'd require a pmos, gate drive, diode, inductor, and cap. I don't know how to link things, I apologize, but if you search for those terms you'll no doubt find a schematic. ^-^
You need an inverting buck-boost, which is an "easy" switched-mode power supply circuit, in its simplest form. It'd require a pmos, gate drive, diode, inductor, and cap. I don't know how to link things, I apologize, but if you search for those terms you'll no doubt find a schematic. ^-^
Jun 8, 2005 #8 djalli Advanced Member level 3 Joined Nov 10, 2001 Messages 825 Helped 31 Reputation 62 Reaction score 15 Trophy points 1,298 Location 1600 Pennsylvania Avenue, Washington DC 20500 Activity points 8,284 A simple ancient 741 opamp can do that
Dec 26, 2005 #9 J johnsmith101 Member level 2 Joined Oct 20, 2005 Messages 53 Helped 8 Reputation 16 Reaction score 2 Trophy points 1,288 Activity points 1,723 You can use an inverting buck-boost switching regulator or an inverting charge pump regulator depending on your load requirements.
You can use an inverting buck-boost switching regulator or an inverting charge pump regulator depending on your load requirements.
Dec 26, 2005 #10 the_risk_master Advanced Member level 2 Joined Aug 12, 2005 Messages 660 Helped 79 Reputation 158 Reaction score 19 Trophy points 1,298 Location UE+MIT, Philippines, (14°N , 120°E ) Activity points 5,514 Or... You may want to connect the 5v to the OpAmp inveting amplifier
Dec 27, 2005 #11 N Nimer Full Member level 3 Joined Apr 26, 2005 Messages 178 Helped 26 Reputation 52 Reaction score 8 Trophy points 1,298 Location PALISTINE Activity points 2,907 hi the use of inverting opamp with unity gain is possible ,choose aone that uses single vcc supply of 5 volts so that you dont use extra sources best regards
hi the use of inverting opamp with unity gain is possible ,choose aone that uses single vcc supply of 5 volts so that you dont use extra sources best regards
Dec 27, 2005 #12 J johnsmith101 Member level 2 Joined Oct 20, 2005 Messages 53 Helped 8 Reputation 16 Reaction score 2 Trophy points 1,288 Activity points 1,723 Sorry, you cannot use an opamp for this since the only supply available is 5V. You definitely have to use some type of switching converter whether it is inductor or capacitor based.
Sorry, you cannot use an opamp for this since the only supply available is 5V. You definitely have to use some type of switching converter whether it is inductor or capacitor based.
Jan 3, 2006 #13 H huji Member level 4 Joined Jul 15, 2004 Messages 76 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,286 Activity points 699 Connect GND between 2 DC 5V supply and u will get 5V & -5V.