Hello,
I try not to bother anyone with any issues I have or unless I am completely against the wall with an issue.
I have built a Plug In The Wall Linear Ham Amplifier with a Non-Regulated 200amp Supply which is besides the point but I am using 6x12v LED 120m Fans on the top for Cooling.
I have an exact replica of this Amplifier already and the builder used 3 X 7812 Voltage Regulators using 1 Regulator Per 2 Fans(Having The Regulators just on slide on heat sinks that kind of look like Money Clips in a sense)
HERE IS A SUMMARY OF THE INFORMATION AND PROBLEM:
Setup:
USING 3 X L7812CV 12v Voltage Regulators
Input Voltage is 19v To Each Regulator
There are 2 X 12v LED Fans on each Voltage Regulator.
Regulators are on a decent size heat sink(Way Bigger Then the one in my other project)
I have a 103(10,000pf) 3KV Ceramic Disc Cap on each V. Reg.[One Leg on output Leg and other Leg of Cap on Ground Leg of each V. Reg.]
Problem:
Voltage Regulators are dropping to around 3v which isn't enough to even spin the fans. Only to light up LEDs on fans very DIM
Tested just 1 Fan on 1 Voltage Regulator and Voltage Drops to around 9v(Which is very very Weird to.)
2xFans only pull .760a on the 19v supply with supplying dropping to 17.9v
2xFans only pull .545a on a 12.52v Supply(Which I guess is what it would be pulling through the Voltage Regulator Right?
I have a total exact replica of this same project that are using KA7812 1amp Voltage Regulators and it works PERFECT! Only other difference is they are using 104(100,00pf) Ceramic Caps instead of 103 like me.
I'm using L7812CV 1.5amp V. Regulators and look at my problem!!!!!!
...............................................................................................
VERY DETAILED INFORMATION IS BELLOW IF NEEDED!!!
```````````````````````````````````````````````````````````
The reason for using these are:
1. These are 12v Fans and the Internal Power Supply Floats at 18-19v.
2. When the Amplifier is in use, the Voltage Drops to around 15v which if wasn't using a Voltage Regulator the Fans would Slow Down. Slow Down, then Speed up...Slow Down then Speed up after unkeying the amplifier....you get it.... which is unprofessional. You want the fans to stay at a constant speed.
H E R E I S T H E P R O B L E M:
After Wiring Everything, Putting a 103(10,000pf) Ceramic Cap On Output Pin on each Regulator and other Leg to Ground Pin(To Ground):
All 6 Fans's LEDs CAME ON VERY DIM AND THE FANS DIDN'T SPIN!!!
So I checked the Output of the Voltage Regulars and each Output was sitting at around 3v. (Which I've checked these fans and they need about 4v to even spin)
So I did some troubleshooting, make sure everything had a very very good ground.
So then I ask my self...is there a way these fans are pulling to much current.....no way....my other project has 2 Fans on each Voltage Regulator.
So I checked, just 1 Fan on 1 Voltage Regulator and the Voltage Dropped to about 9v or so......THEN I WAS REALLY REALLY CONFUSED!!!!!! WHAT IS GOING ON HERE!!!!
So Then I did a Amp Reading on the Fan. Here is what I got, which I now is weird but this is what I got.
.............................................................................................
First Reading was using 3X Big Marine Batteries In Parallel(Should be charged decently):
.............................................................................................
Batteries Standing Voltage: 12.52v
1 X Fan = .285ma (Voltage From Batteries Dropped to 11.82v)
2 X Fans = .545ma (Voltage From Batteries Dropped to 10.97v)
[The Voltage Drop is Weird but maybe the batteries are weak, I have had them in Parallel for about 2 months and have used them for testing and such]
Then I took 2 of the same Fans that I didn't care about and tested there amp draw from the Power Supply the fans will be running off of which the Internal Power Supply of this Amp Floats at exactly 19.2v. Here is the data:
Power Supply Standing Voltage: 19.2v
1 X Fan = .384ma (Voltage From Power Supply Dropped to 18.30v)
2 X Fan = .760ma (Voltage From Power Supply Dropped to 17.90v)
I understand more Volts Less Amps but I'm guessing that the 3 Batteries are just needing charged because once these fans got more Voltage from the Power Supply they pulled more Amps then on the batteries.
Note: I only hooked fans up for a few seconds so they wouldn't be damaged from the Higher Voltage.
So, I did that test to see what they would be pulling. And it is no where near the Max of Each Voltage Regulator?
So why is 1 Voltage Regulator Dropping to around 9v with only 1 Fan On it, and why is 1 Voltage Regulator Dropping to around 3v with 2 fans on it.
.............................................................................................
NEXT THING I CHECKED WAS THIS, WHICH I HAVE A ? ABOUT ALSO
.............................................................................................
Then I was curious of what kind of Voltage Regulators were being used in the Amplifier that works perfect.(I have had the Fans on the other amp running for hours and never had an heat issue or anything)
I also checked the fans on the other Amplifier and there amps pull were .400ma per fan, so there fans are pulling even more current then the ones I'm using.
SO CHECK THIS OUT:
I LOOKED AT THE VOLTAGE REGULATORS BEING USED ON THAT AMPLIFIER FOR THE FANS AND THEY ARE THIS:
KA7812 12v Voltage Regulator and only have a capacity of 1A
I am using L7812CV Voltage Regulators and are 1.5A
I checked both DATASHEETS and couldn't see a difference really.
The only Difference I saw in the other Amplifier was that they were using 104(100,000pf) Ceramic Disc Cap on the Output of each Regulator and I am using 103's but I've read I can use either or.
So my back is up against the wall, what am I doing wrong here??????????
I am sorry for writing so much but I just wanted to make sure I have all the information so that there are no questions.
SOMEONE PLEASE PLEASE PLEASE PLEASE HELP! IT WILL BE THE BIGGEST BLESSING, THIS IS FOR A FRIEND OF MINE THAT HAS BEEN WAITING FOR ABOUT 6 MONTHS ON THIS.
THANKS SO MUCH!
I try not to bother anyone with any issues I have or unless I am completely against the wall with an issue.
I have built a Plug In The Wall Linear Ham Amplifier with a Non-Regulated 200amp Supply which is besides the point but I am using 6x12v LED 120m Fans on the top for Cooling.
I have an exact replica of this Amplifier already and the builder used 3 X 7812 Voltage Regulators using 1 Regulator Per 2 Fans(Having The Regulators just on slide on heat sinks that kind of look like Money Clips in a sense)
HERE IS A SUMMARY OF THE INFORMATION AND PROBLEM:
Setup:
USING 3 X L7812CV 12v Voltage Regulators
Input Voltage is 19v To Each Regulator
There are 2 X 12v LED Fans on each Voltage Regulator.
Regulators are on a decent size heat sink(Way Bigger Then the one in my other project)
I have a 103(10,000pf) 3KV Ceramic Disc Cap on each V. Reg.[One Leg on output Leg and other Leg of Cap on Ground Leg of each V. Reg.]
Problem:
Voltage Regulators are dropping to around 3v which isn't enough to even spin the fans. Only to light up LEDs on fans very DIM
Tested just 1 Fan on 1 Voltage Regulator and Voltage Drops to around 9v(Which is very very Weird to.)
2xFans only pull .760a on the 19v supply with supplying dropping to 17.9v
2xFans only pull .545a on a 12.52v Supply(Which I guess is what it would be pulling through the Voltage Regulator Right?
I have a total exact replica of this same project that are using KA7812 1amp Voltage Regulators and it works PERFECT! Only other difference is they are using 104(100,00pf) Ceramic Caps instead of 103 like me.
I'm using L7812CV 1.5amp V. Regulators and look at my problem!!!!!!
...............................................................................................
VERY DETAILED INFORMATION IS BELLOW IF NEEDED!!!
```````````````````````````````````````````````````````````
The reason for using these are:
1. These are 12v Fans and the Internal Power Supply Floats at 18-19v.
2. When the Amplifier is in use, the Voltage Drops to around 15v which if wasn't using a Voltage Regulator the Fans would Slow Down. Slow Down, then Speed up...Slow Down then Speed up after unkeying the amplifier....you get it.... which is unprofessional. You want the fans to stay at a constant speed.
H E R E I S T H E P R O B L E M:
After Wiring Everything, Putting a 103(10,000pf) Ceramic Cap On Output Pin on each Regulator and other Leg to Ground Pin(To Ground):
All 6 Fans's LEDs CAME ON VERY DIM AND THE FANS DIDN'T SPIN!!!
So I checked the Output of the Voltage Regulars and each Output was sitting at around 3v. (Which I've checked these fans and they need about 4v to even spin)
So I did some troubleshooting, make sure everything had a very very good ground.
So then I ask my self...is there a way these fans are pulling to much current.....no way....my other project has 2 Fans on each Voltage Regulator.
So I checked, just 1 Fan on 1 Voltage Regulator and the Voltage Dropped to about 9v or so......THEN I WAS REALLY REALLY CONFUSED!!!!!! WHAT IS GOING ON HERE!!!!
So Then I did a Amp Reading on the Fan. Here is what I got, which I now is weird but this is what I got.
.............................................................................................
First Reading was using 3X Big Marine Batteries In Parallel(Should be charged decently):
.............................................................................................
Batteries Standing Voltage: 12.52v
1 X Fan = .285ma (Voltage From Batteries Dropped to 11.82v)
2 X Fans = .545ma (Voltage From Batteries Dropped to 10.97v)
[The Voltage Drop is Weird but maybe the batteries are weak, I have had them in Parallel for about 2 months and have used them for testing and such]
Then I took 2 of the same Fans that I didn't care about and tested there amp draw from the Power Supply the fans will be running off of which the Internal Power Supply of this Amp Floats at exactly 19.2v. Here is the data:
Power Supply Standing Voltage: 19.2v
1 X Fan = .384ma (Voltage From Power Supply Dropped to 18.30v)
2 X Fan = .760ma (Voltage From Power Supply Dropped to 17.90v)
I understand more Volts Less Amps but I'm guessing that the 3 Batteries are just needing charged because once these fans got more Voltage from the Power Supply they pulled more Amps then on the batteries.
Note: I only hooked fans up for a few seconds so they wouldn't be damaged from the Higher Voltage.
So, I did that test to see what they would be pulling. And it is no where near the Max of Each Voltage Regulator?
So why is 1 Voltage Regulator Dropping to around 9v with only 1 Fan On it, and why is 1 Voltage Regulator Dropping to around 3v with 2 fans on it.
.............................................................................................
NEXT THING I CHECKED WAS THIS, WHICH I HAVE A ? ABOUT ALSO
.............................................................................................
Then I was curious of what kind of Voltage Regulators were being used in the Amplifier that works perfect.(I have had the Fans on the other amp running for hours and never had an heat issue or anything)
I also checked the fans on the other Amplifier and there amps pull were .400ma per fan, so there fans are pulling even more current then the ones I'm using.
SO CHECK THIS OUT:
I LOOKED AT THE VOLTAGE REGULATORS BEING USED ON THAT AMPLIFIER FOR THE FANS AND THEY ARE THIS:
KA7812 12v Voltage Regulator and only have a capacity of 1A
I am using L7812CV Voltage Regulators and are 1.5A
I checked both DATASHEETS and couldn't see a difference really.
The only Difference I saw in the other Amplifier was that they were using 104(100,000pf) Ceramic Disc Cap on the Output of each Regulator and I am using 103's but I've read I can use either or.
So my back is up against the wall, what am I doing wrong here??????????
I am sorry for writing so much but I just wanted to make sure I have all the information so that there are no questions.
SOMEONE PLEASE PLEASE PLEASE PLEASE HELP! IT WILL BE THE BIGGEST BLESSING, THIS IS FOR A FRIEND OF MINE THAT HAS BEEN WAITING FOR ABOUT 6 MONTHS ON THIS.
THANKS SO MUCH!