Surf 1.2 PI Help

[Firebird]

Hi,
Got my Surf 1.2 PI kit, layed all components out but confused with the red resistors C3/4/8/16/18 are all 100nF but 4 of the 5 have 1000 100- with no nF or uF on them and the other one has 0.1 63- with no uF nF also C9/10/11/12 should be 1nF but the 4 that are left just have 10 on them, can anyone confirm please?
Regards
Russell

[kenny444]

Hello I found this by accident, I am not your best expert, but let me try and help. Resistors have a background colour (blue or beige) and painted rings to id them, Capacitors (the red blobs) are generally numeric.

Caps come in "Micro uF millionths of a Farad", "Nano Farad caps nF are a 1000 times smaller" and "Pico Farads pF are another 1000 times smaller". Numbers like 221 = 220 pF, 100nf = .1, 1nF = .001, they are not handed and can be put in either way. But Electrolytic caps have a + & - the long leg is normally + and the - (negative) is normally marked with a white line with minuses in it. K

[Firebird]

Thank you Kenny, with your info I would have been able to work it out but I got in contact with Silverdog who sorted it.
Thanks again
Russell

[BOND]

Hello Guys,

How can we assemble all the resistors In in a correct direction as per the color coding or value,since the Surf Pi 1.2 kit has no directional mark for the head and tail of the resistors.
May I ask any opinions from you guys if anyone who knows the right direction of these resistors. because I am really confused about it...

[paku]

Hello Guys,

How can we assemble all the resistors In in a correct direction as per the color coding or value,since the Surf Pi 1.2 kit has no directional mark for the head and tail of the resistors.
May I ask any opinions from you guys if anyone who knows the right direction of these resistors. because I am really confused about it...

use this website if you dont know how to read the color code select 5 band or 4 band what resistor you use

http://www.electronics2000.co.uk/cal...calculator.php

and this is part list from silverdog kit

http://www.silverdog.co.uk/shop/imag.../partslist.txt

[silverdog]

resistors can go in anyway around

[kenny444]

Hello Bond. As the nice Mr Silverdog said, resistors are not directional, they work both ways, they are just a carbon track and are not an active component. Capacitors are directional sometimes (Electrolitics are marked Minus with a white stripe normally, the smaller square ones can go in either way. Diodes are one way devices, the + current flows into the none painted end and comes out the painted (ringed end), its stops feedback into the circuit. IC's have a cut out or a ring marker at the number 1 end. This is a simplified description I do hope you enjoy what you are doing. A small cheap multimeter will help you with resistor values and diode checks.

[Koala]

resistors can go in anyway around

They do look pretty if you but them face the same way as you would read them. LOL



I do remember someone being wound up with this when I was young as well as someone being told to go to the stores for "a long wait" wounder if they are still there

[BOND]

Thanks guys for the information and opinions, Now I'm so sure what I am doing ,Actually I have the complete files of SURF Pi 1.2 from schematic diagram, pcb layout and components list... I started built SURF Pi 1.2 and I bought all the components in a various electronic components shop here in UAE ,but there are three things that I'm still looking for the ICL7660,NE5534P AND MPSA13.

[paku]

ICL7660,NE5534P AND MPSA13.
just buy on ebay or www.taydaelectronics.com

[BOND]

Paku thanks a lot for that info, I made an order already to some local electronic shop here I hope it will arrived on monday.....

[Tatt2o]

values of C3 and C18 SURF PI 1.2

Hello everyone,

After buying and mounting the silverdog kit for surfing PI 1.2 I need a little help because I have the U5 that heats me too. The output voltage U5 is not 5V but 2V. The U5 input has a voltage of 12V.I have controlled all the resistors and they are ok. Yet when I control capacitors C3 and C18 indicate 100μF instead of 100nf (indicated on check list).
Can you tell me what should be the values of C3 and C18? and is that at a ratio with U5 that heats and gives 2 V output. I am providing you with a photo of the assembly as an attachment.

Thank you all.

[6666]

Assuming that we are looking at the same circuit c3 and c18 appear to be 100N, U5 should not be hot and should be around 5 volts, inspect your PCB carefully and look for faults

[waltr]

U5 is a simple 3-term regulator. If output is 2V then most likely there i should wrong else where on the board.
Pull ALL chip that get powered by +5V. If output doesn't go to near +5V there look for solder shorts and other wrong parts.
A wrong vale Cap will not cause this.

C3 & C18 can be 100n or 100u but the schematic I have is WRONG. C18 should NOT be between +5 and -5. This has been noted is this forum and can cause latch up issues.
Remove C3 & C18 to see if this fixes the U5 problem.

If it fixes the problem then install 4 caps- 2 each from +5 to GND & 2 each from GND to -5V.

[Tatt2o]

First of all thank you all for your help.
I removed in turn the integrated circuit on 5V. When I remove the NE5534 (U2) I found 5V output of U5 and it no longer heats. I think I need to replace the NE5534. is not it?
Thank you.