Hi,
I have just completed putting the kit together but turned on and nothing. Check over all looks ok but noticed that I’m getting 4.25v instead of the 3.3 expected?
Obviously down to an error I’ve made - best course of action?
John
Are you getting 4.25V from the output of VR1 (LM317LZ) ?
Vr1 is also presenting 4.25v…
Have you checked these resistors:
R8 = 680 ohms
R13 = 1k1
Check also the VR1.
[quote=“VEL255”]Have you checked these resistors:
R8 = 680 ohms
R13 = 1k1
Check also the VR1.[/quote]
R8 = 680 ohms
R13 = 1k2… (Checked the data sheet for the LM317LZ and this combination should output 3.45v.
Checked the lm317 = 6.25 v I ( new batteries) 4.6v out. Calculator shows output should be 3.45…
Pins on SK7 show (top row) 4.5, 0, 0, 0, 4.5, 0, 4.5, 0, 0
Bottom row 0, 4.5, 0, 0, 4.5, 4.5, 0, 4.5, 0.01(?)
Test pin 2.6v
R8 = 680 ohms
R13 = 1k2… (Checked the data sheet for the LM317LZ and this combination should output 3.45v.
Checked the lm317 = 6.25 v I ( new batteries) 4.6v out. Calculator shows output should be 3.45…
Pins on SK7 show (top row) 4.5, 0, 0, 0, 4.5, 0, 4.5, 0, 0
Bottom row 0, 4.5, 0, 0, 4.5, 4.5, 0, 4.5, 0.01(?)
Test pin 2.6v
[quote]Pins on SK7 show (top row) 4.5, 0, 0, 0, 4.5, 0, 4.5, 0, 0
Bottom row 0, 4.5, 0, 0, 4.5, 4.5, 0, 4.5, 0.01(?)
Test pin 2.6v[/quote]
In a working unit there seems to be following voltages:
Pins on SK7 top row 3.3, 0, 0, 0, 0, 0, 3.3, 0, 0.4
Bottom row 0, 3.3, 0, 0, 0, 0, 0, 3.3, 0
Test pin 1.6V
You can return the EDU08 for inspection/repair to your local Velleman dealer or direct to:
Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere
Belgium
Will return for inspection/ repair back to Belgium.
Is there a reference number I need to quote please?
If you are a US resident, please call (817) 284 77 85 for RMA#.