Re: gEDA-user: lost newbie

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

Ok if we are going to recomend a reading list I would suggest "Power
Supplies Projects for the Hobbyist and Technician" by David Lines ISBN
0-7906-1120-1 Master Publishing, Inc


I took the liberty to redraw the origional schematic and then a couple
of modified versions of it. None of which I would use to build a real
power supply from, but hopefully educationaly usefull.

Steve Meier

v 20050313 1
C 61400 46700 1 90 0 capacitor-1.sym
{
T 61100 46700 5 10 1 1 90 0 1
refdes=C2
}
C 62500 46700 1 90 0 capacitor-1.sym
{
T 62200 46800 5 10 1 1 90 0 1
refdes=C4
}
C 66600 47100 1 270 0 capacitor-2.sym
{
T 66700 46200 5 10 1 1 90 0 1
refdes=C5
}
C 62000 47600 1 90 1 capacitor-2.sym
{
T 61700 47000 5 10 1 1 90 6 1
refdes=C3
}
C 63000 46700 1 270 0 led-2.sym
{
T 63300 46700 5 10 1 1 270 0 1
refdes=D5
}
C 64700 46800 1 0 0 lm7815-1.sym
{
T 66100 47800 5 10 1 1 0 6 1
refdes=U1
}
C 64700 46200 1 90 0 zener-2.sym
{
T 64400 46500 5 10 1 1 90 0 1
refdes=Z1
}
C 63800 46900 1 270 1 resistor-variable-2.sym
{
T 64200 47450 5 10 1 1 90 2 1
refdes=R1
}
C 59900 46800 1 90 0 diode-1.sym
{
T 59400 47100 5 10 1 1 90 0 1
refdes=D3
}
C 59900 45500 1 90 0 diode-1.sym
{
T 59400 45800 5 10 1 1 90 0 1
refdes=D4
}
C 59000 45500 1 90 0 diode-1.sym
{
T 58500 45800 5 10 1 1 90 0 1
refdes=D1
}
C 59000 46800 1 90 0 diode-1.sym
{
T 58500 47100 5 10 1 1 90 0 1
refdes=D2
}
C 67700 46200 1 90 0 capacitor-1.sym
{
T 67400 46300 5 10 1 1 90 0 1
refdes=C6
}
C 56600 45400 1 0 0 transformer-1.sym
{
T 56900 46700 5 10 1 1 0 0 1
refdes=T1
}
C 56600 45600 1 90 0 voltage-1.sym
{
T 56100 45900 5 10 1 1 90 0 1
refdes=V1
}
N 56400 46500 56600 46500 4
N 56400 45600 56400 45500 4
N 56400 45500 56600 45500 4
C 60400 47600 1 270 0 capacitor-2.sym
{
T 60500 46800 5 10 1 1 90 0 1
refdes=C1
}
N 58800 46800 58800 46400 4
N 58100 46500 58800 46500 4
N 58100 45500 58100 45200 4
N 58800 45200 58800 45500 4
N 59700 45200 59700 45500 4
N 59700 46400 59700 46800 4
N 58800 47700 58800 48000 4
N 59700 48000 59700 47700 4
N 58800 48000 63900 48000 4
N 63900 48000 63900 47800 4
N 63100 46700 63100 48000 4
N 62300 47600 62300 48000 4
N 61800 47600 61800 48000 4
N 61200 47600 61200 48000 4
N 60600 47600 60600 48000 4
N 60600 45200 60600 46700 4
N 61200 45200 61200 46700 4
N 61800 45200 61800 46700 4
N 62300 45200 62300 46700 4
N 58100 45200 69000 45200 4
N 63100 45200 63100 45800 4
N 63900 46900 63900 45200 4
N 64700 47400 64400 47400 4
N 64600 47000 64600 47400 4
N 64600 46200 64600 45200 4
N 65500 46800 65500 45200 4
N 66800 46200 66800 45200 4
N 67500 46200 67500 45200 4
N 66300 47400 69000 47400 4
N 66800 47100 66800 47400 4
N 67500 47100 67500 47400 4
C 63600 44600 1 0 0 gnd-1.sym
N 63700 44900 63700 45200 4
T 60100 44600 9 10 1 0 180 0 1
D1 is on only when Va is less then ground
T 59000 46500 9 10 1 0 0 0 1
Va
T 59100 48200 9 10 1 0 0 0 1
Vb
T 68200 47500 9 10 1 0 0 0 1
Vout
T 62000 44300 9 10 1 0 180 0 1
D2 is on when Va is greater Vb by the voltage drop of one diode
T 56500 43400 9 10 1 0 0 0 1
Vb at most is 1 diode drop bellow Va
C 61100 41200 1 90 0 capacitor-1.sym
{
T 60800 41200 5 10 1 1 90 0 1
refdes=C2
}
C 62200 41200 1 90 0 capacitor-1.sym
{
T 61900 41300 5 10 1 1 90 0 1
refdes=C4
}
C 66300 41600 1 270 0 capacitor-2.sym
{
T 66400 40700 5 10 1 1 90 0 1
refdes=C5
}
C 61700 42100 1 90 1 capacitor-2.sym
{
T 61400 41500 5 10 1 1 90 6 1
refdes=C3
}
C 62700 41200 1 270 0 led-2.sym
{
T 63000 41200 5 10 1 1 270 0 1
refdes=D5
}
C 64400 41300 1 0 0 lm7815-1.sym
{
T 65800 42300 5 10 1 1 0 6 1
refdes=U1
}
C 64400 40700 1 90 0 zener-2.sym
{
T 64100 41000 5 10 1 1 90 0 1
refdes=Z1
}
C 63500 41400 1 270 1 resistor-variable-2.sym
{
T 63900 41950 5 10 1 1 90 2 1
refdes=R1
}
C 67400 40700 1 90 0 capacitor-1.sym
{
T 67100 40800 5 10 1 1 90 0 1
refdes=C6
}
C 56000 40100 1 0 0 transformer-1.sym
{
T 56300 41400 5 10 1 1 0 0 1
refdes=T1
}
C 56000 40300 1 90 0 voltage-1.sym
{
T 55500 40600 5 10 1 1 90 0 1
refdes=V1
}
N 55800 41200 56000 41200 4
N 55800 40300 55800 40200 4
N 55800 40200 56000 40200 4
C 60100 42100 1 270 0 capacitor-2.sym
{
T 60200 41300 5 10 1 1 90 0 1
refdes=C1
}
N 57500 41200 59400 41200 4
N 57500 40200 57500 41000 4
C 62900 41500 1 90 0 resistor-1.sym
{
T 62600 41700 5 10 1 1 90 0 1
refdes=R2
}
N 58500 42500 63600 42500 4
N 63600 42500 63600 42300 4
N 62800 42400 62800 42500 4
N 62000 42100 62000 42500 4
N 61500 42100 61500 42500 4
N 60900 42100 60900 42500 4
N 60300 42100 60300 42500 4
N 60300 39700 60300 41200 4
N 60900 39700 60900 41200 4
N 61500 39700 61500 41200 4
N 62000 39700 62000 41200 4
N 58500 39700 68700 39700 4
N 62800 39700 62800 40300 4
N 62800 41200 62800 41500 4
N 63600 41400 63600 39700 4
N 64400 41900 64100 41900 4
N 64300 41500 64300 41900 4
N 64300 40700 64300 39700 4
N 65200 41300 65200 39700 4
N 66500 40700 66500 39700 4
N 67200 40700 67200 39700 4
N 66000 41900 68700 41900 4
N 66500 41600 66500 41900 4
N 67200 41600 67200 41900 4
C 63300 39100 1 0 0 gnd-1.sym
N 63400 39400 63400 39700 4
T 58800 42700 9 10 1 0 0 0 1
Vb
T 67900 42000 9 10 1 0 0 0 1
Vout
C 59600 41300 1 90 0 diode-1.sym
{
T 59100 41600 5 10 1 1 90 0 1
refdes=D3
}
C 59600 40000 1 90 0 diode-1.sym
{
T 59100 40300 5 10 1 1 90 0 1
refdes=D4
}
C 58700 40000 1 90 0 diode-1.sym
{
T 58200 40300 5 10 1 1 90 0 1
refdes=D1
}
C 58700 41300 1 90 0 diode-1.sym
{
T 58200 41600 5 10 1 1 90 0 1
refdes=D2
}
N 58500 41300 58500 40900 4
N 58500 39700 58500 40000 4
N 59400 39700 59400 40000 4
N 59400 40900 59400 41300 4
N 58500 42200 58500 42500 4
N 59400 42500 59400 42200 4
T 58600 41000 9 10 1 0 0 0 1
Va
N 58500 41000 57500 41000 4
T 59500 41100 9 10 1 0 0 0 1
Vc
T 55800 38500 9 10 1 0 0 0 1
When Va > ground > Vc then D4 is on
T 55800 38200 9 10 1 0 0 0 1
Vb will be 1 diode drop bellow Va
T 64200 42200 9 10 1 0 0 0 1
Vd
T 64000 38500 9 10 1 0 0 0 1
Vd = R1'/R1 Vb
T 59900 38500 9 10 1 0 0 0 1
When Va < ground < Vc then D1 is on
T 60000 38200 9 10 1 0 0 0 1
Vb will be 1 diode drop bellow Vc
T 63700 38100 9 10 1 0 0 0 1
Expect a lot of Ripple on Vb as Diodes turn on and off
C 62500 34600 1 90 0 capacitor-1.sym
{
T 62200 34600 5 10 1 1 90 0 1
refdes=C2
}
C 63600 34600 1 90 0 capacitor-1.sym
{
T 63300 34700 5 10 1 1 90 0 1
refdes=C4
}
C 65900 35600 1 270 0 capacitor-2.sym
{
T 66000 34700 5 10 1 1 90 0 1
refdes=C5
}
C 63100 35500 1 90 1 capacitor-2.sym
{
T 62800 34900 5 10 1 1 90 6 1
refdes=C3
}
C 59800 35200 1 270 0 led-2.sym
{
T 60100 35200 5 10 1 1 270 0 1
refdes=D5
}
C 64000 35300 1 0 0 lm7815-1.sym
{
T 65400 36300 5 10 1 1 0 6 1
refdes=U1
}
C 64000 34700 1 90 0 zener-2.sym
{
T 64200 34800 5 10 1 1 90 0 1
refdes=Z1
}
C 60600 35400 1 270 1 resistor-variable-2.sym
{
T 61000 35950 5 10 1 1 90 2 1
refdes=R1
}
C 67000 34700 1 90 0 capacitor-1.sym
{
T 66700 34800 5 10 1 1 90 0 1
refdes=C6
}
C 55600 34100 1 0 0 transformer-1.sym
{
T 55900 35400 5 10 1 1 0 0 1
refdes=T1
}
C 55600 34300 1 90 0 voltage-1.sym
{
T 55100 34600 5 10 1 1 90 0 1
refdes=V1
}
N 55400 35200 55600 35200 4
N 55400 34300 55400 34200 4
N 55400 34200 55600 34200 4
C 61500 35500 1 270 0 capacitor-2.sym
{
T 61600 34700 5 10 1 1 90 0 1
refdes=C1
}
N 57100 35200 59000 35200 4
N 57100 34200 57100 35000 4
C 60000 35500 1 90 0 resistor-1.sym
{
T 59700 35700 5 10 1 1 90 0 1
refdes=R2
}
N 58100 36500 60700 36500 4
N 60700 36500 60700 36300 4
N 59900 36400 59900 36500 4
N 63400 35500 63400 35900 4
N 62900 35500 62900 35900 4
N 62300 35500 62300 35900 4
N 61700 35500 61700 35900 4
N 61700 33700 61700 34600 4
N 62300 33700 62300 34600 4
N 62900 33700 62900 34600 4
N 63400 33700 63400 34600 4
N 58100 33700 68300 33700 4
N 59900 33700 59900 34300 4
N 59900 35200 59900 35500 4
N 60700 35400 60700 33700 4
N 64000 35900 61200 35900 4
N 63900 35500 63900 35900 4
N 63900 34700 63900 33700 4
N 64800 35300 64800 33700 4
N 66100 34700 66100 33700 4
N 66800 34700 66800 33700 4
N 65600 35900 68300 35900 4
N 66100 35600 66100 35900 4
N 66800 35600 66800 35900 4
C 60400 33100 1 0 0 gnd-1.sym
N 60500 33400 60500 33700 4
C 59200 35300 1 90 0 diode-1.sym
{
T 58700 35600 5 10 1 1 90 0 1
refdes=D3
}
C 59200 34000 1 90 0 diode-1.sym
{
T 58700 34300 5 10 1 1 90 0 1
refdes=D4
}
C 58300 34000 1 90 0 diode-1.sym
{
T 57800 34300 5 10 1 1 90 0 1
refdes=D1
}
C 58300 35300 1 90 0 diode-1.sym
{
T 57800 35600 5 10 1 1 90 0 1
refdes=D2
}
N 58100 35300 58100 34900 4
N 58100 33700 58100 34000 4
N 59000 33700 59000 34000 4
N 59000 34900 59000 35300 4
N 58100 36200 58100 36500 4
N 59000 36500 59000 36200 4
N 58100 35000 57100 35000 4
T 58400 36700 9 10 1 0 0 0 1
Vb
T 67500 36000 9 10 1 0 0 0 1
Vout
T 58200 35000 9 10 1 0 0 0 1
Va
T 59100 35100 9 10 1 0 0 0 1
Vc
T 63800 36200 9 10 1 0 0 0 1
Vd
T 59500 32400 9 10 1 0 0 0 1
Expect less Ripple on Vd as R1 and the 4 capacitors function as a low pass filter
T 61200 48600 9 10 1 0 0 0 1
Redraft of original schematic
T 58500 44000 9 10 1 0 180 0 1
D3 and D4 are useless
T 62500 43800 9 10 1 0 180 0 1
D5 the led i expect to die quickly as too much current rushes through it
T 55800 31900 9 10 1 0 0 0 1
I would also move R2 and D5 to Vout so that I can tell when I actually a working power supply rather then a power supply with a input voltage