Testing a 78L05 regulator ??

[petere]

Success
Thanks again

[petere]

Will do
Thanks guys

[kt315]

[chemelec]

Make Sure you Connect it Correctly.

[petere]

Hi kt315
I have checked as you suggest, two give a reading of < 1v all the others read 0v. Will pick up a new one tomorrow and try not to fry it.
Thanks

[kt315]

check those 'checked' 78l05's BEFORE soldering AGAIN. do NOT connect RED positive wire from the batts to GND pins of the stabs

[petere]

Thank you all for your input.
The batteries are correct, the case is wired to suit them in this orientation. Around 12v.
On the HH PCB I am getting -5.88v at pin 2 on IC1 and 10.02v on pin 3 of IC2, 0v at pin 2 of IC2 and 0.29v on pin 1. This is the 4th time I have swapped out IC2. Getting good practice at desoldering.
I am sure the regulators I have are not working as they should, maybe I buggered them while testing, a couple did go up in smoke. Anyway I shall keep at till I sort it
I did successfully build a working Surf PI last year and thought I might try and extend myself. I really do not know much about electronics but it keeps my mind active.
Cheers

[mykaitch]

Have been working on building a Rev C Hammerhead and have struck problems with the +5v output on IC2. I have followed instructions up to IC6 and everything seems good (now that I replaced the ICL7660) except for the voltage at pin 7 on IC 6 and the output of IC2. I have gone through around 15 78L05's and none of them seem to be any good. Is this a valid way to check them? (see pic) The batteries are around 12v.
Thanks

15? Wow! The odd one might be duff but never a 'batch'.

[kt315]

[kt315]

[kt315]

[kt315]

[kt315]

its bad that someone does try learn electronics on metaldetecting.
ok... i will give the lessons...

[Qiaozhi]

Have been working on building a Rev C Hammerhead and have struck problems with the +5v output on IC2. I have followed instructions up to IC6 and everything seems good (now that I replaced the ICL7660) except for the voltage at pin 7 on IC 6 and the output of IC2. I have gone through around 15 78L05's and none of them seem to be any good. Is this a valid way to check them? (see pic) The batteries are around 12v.
Thanks

You haven't exactly chosen the easiest project to start your exploration of metal detector technology.
The Hammerhead is not a design you should tackle until you understand the basics. It was never intended as a project for beginners. I would suggest starting off with something much easier, especially as you seem to be struggling with getting a simple linear power supply to work properly.

[kt315]

I have connected the positive lead to ground because that is how it is connected on the Hammerhead.
---
you do something wrong. in HH schrmatic 2 pin of 78l05 connects to GND (+BATT) but it does supply from 7660 that gives MORE voltage.
ie on INPUT of the stab MORE voltage GOES than on +BATT -!
while you try check the stab in CLASSIC schematic view but do all wrong. DO ALL ACCORDING THE DATASHEET ON THE STAB DO NOT REFFERING
ON HAMMERHEAD SCHEMATIC