Any hardware store should sell M3 nuts and bolts if they don't then they cant call themselves hardware store.

I was thinking international difference

 

M3 is world standard for bolt size. They should know what bolt you want.
I'm going to post the schematics for lm317 and explain how it works when I get on the computer.

 

317 1.5A; 350 3A why not the 350 then, seems everything else is the same except the 317 is 1.2-37V 1.5A and 350 is 1.2-33V 3A both cost almost only the petrol for the journey.

 

I just had 317 stuck in my head but you can use lm350.

 

You guys, I would really like to thank you for all your help! This must be the friendliest forum on the web! THX

 

http://diyaudioprojects.com/Technical/Voltage-Regulator/ a resistance calculator that could have been friendlier, by letting you specify 2 of the 3 variables, but by specifying values available I got it to 5.046V R1=270 R2=820, don't know if there is set values that will get me closer to 5V?

 

http://diyaudioprojects.com/Technical/Voltage-Regulator/ a resistance calculator that could have been friendlier, by letting you specify 2 of the 3 variables, but by specifying values available I got it to 5.046V R1=270 R2=820, don't know if there is set values that will get me closer to 5V?

39ohm,120ohm,5.096V
33,100,5.038V

Think it possible to get more accurate?

 

R1 need's to be 220-240 Ohm,
R2 can be any value.

Use R1 240 R2 750=5,16V that is close enough.

 

The tolerance of the regulator reference voltage will also give some variation in the output voltage from the ideal, even with exact resistors. If you want exactly 5V then you can use a pot (connected as a rheostat) for one of the resistors, but note that 5V circuits are typically designed to operate properly with +/- 5% tolerance on their supply voltage.

 

Hello,

Here is a tip for mounting the TO220 isolated, as the tab of the device will be connected to the middle pin.
The grid on the picture is 5mm, to have an idea of the size.
As you can see the black ring has a rimm that goes into the hole of the TO220 device.
(shown in the picture is an old transistor).

Bertus

 

R1 need's to be 220-240 Ohm,
R2 can be any value.

Use R1 240 R2 750=5,16V that is close enough.

I can only get 220, so R2 680 = 5.114 That'll obviously also do.

 

That will do,i'll post LM350 schematics and some explanations in 1-2h.

 

That will do,i'll post LM350 schematics and some explanations in 1-2h.

cool no rush

 

Here is a very basic explanation of the circuit.The explanation is pretty basic since you probably know what capacitor and similar passive parts are.If someone has more time to make it more detailed i'd be glad if they could hop in and explain it a bit better.
Pay attention to the equations.

 

Found the old pictures and an interesting power supply thread.

http://forum.allaboutcircuits.com/threads/simple-benchtop-power-supplies.31158/#post-193317

 

could R2 be 680 and R1 220?

 

I can only get 220, so R2 680 = 5.114 That'll obviously also do.

That will not do for TTL logic circuitry.

You need the +5 volts to be as exact as you can make it.
TTL is more sensitive to overvoltage. 5.1 is within range but too close to the TTL range of 4.75V - 5.25V supply.
Further the 5V provides the reference level for the logic pulses.

By contrast the CMOS voltage range is +3V to +15V

This is a good opportunity to practise your series and parallel skils to get your resistors closer in combination, though most practical people would use a trimpot and set the final value to give correct output with a voltmeter.

 

what wattage should trimpot be, I can get cement trimmers for 0.75W
other trimmers 0.1W

 

Hello,

The use of a trimpot will be needed, as the LM also can have an other reference voltage (between 1.2 and 1.3 volts).
Also check the datasheet if you need a resistor of 240 Ohms or 120 Ohms from the output to the reference pin.

Bertus

 

R1 220 R2 750 and 0.5FV schottky will give you 5V.Low W pot will work there is only small current going trough it.