Surf pi help

[emrdgnn]

Hello to everyone I'm sorry for my bad english. I made the surf pi circuit. It just beeps all the time. I noticed that the coil voltage is too low, what do you think is the problem.

[Carl-NC]

Not enough information.

[emrdgnn]

I'm heating 78l05 and measuring Ne5534p 6.pin 1.30v. I hear continuous and very low sound (when it sounds) I checked the resistors and it's I used 2n3906 instead of bc327

[Polymer]

I'm heating 78l05 and measuring Ne5534p 6.pin 1.30v. I hear continuous and very low sound (when it sounds) I checked the resistors and it's I used 2n3906 instead of bc327

Heating 78l05 ??? Should not be getting hot, if you mean this. Then something is wrong.

Please post a picture of the bottom side of your PCB. It helps find mistakes.

[waltr]

I'm heating 78l05 and measuring Ne5534p 6.pin 1.30v. I hear continuous and very low sound (when it sounds) I checked the resistors and it's I used 2n3906 instead of bc327

As stated- the 78L05 should not get HOT.
What is the input and output Voltage the the 78L05????

Pin 6 of the preamp is the output. 1.3V is a high offset but unknow why.
What are the Voltages on pin 4 & 7 of the premap???

What does the Preamp output look like on an O'scope??

[emrdgnn]

pcb rear view like this
http://pasteboard.co/JfODwrj.jpg

[waltr]

Hard to tell for sure but a lot of the soldering does not look good.
Looks like the solder did not FLOW onto the copper circuit.

[Carl-NC]

Look carefully for solder bridges. Several places look extremely close. In the future, build your circuit in stages. Start with the power supplies, verify as you go.

[Mdtoday]

pcb rear view like this
http://pasteboard.co/JfODwrj.jpg

emrdgnn,

Start by removing the socketed devices and check the power supply voltages.
Use some solder flux and go over all of those solder joints again, there are multiple dry joints and what looks like solder bridges. Clean the whole track side of the board with a flux cleaner.



cheers

Mdtoday

[Polymer]

Which schematic did you use for the Surf PI? Is it a proven working one?

You may want to check the connections/pinout of the 78L05.
The pinout is different to the 79L05. It happened to me as I thought they are the same. It got very hot ... failure

Already mentioned: Check your input and output voltages, solder bridges, bad solder spots.

Please post all pictures in this forum instead of on external websites. They often "disappear" and a thread can become useless because of this.

Good Luck and successful fault finding.

[emrdgnn]

How many volts should I see on the feet of Bc327

[emrdgnn]

I solved the 78l05 warm-up problem 5534 6.pin 0.03 v is constantly beeping. When playing with volume and treshold, sound changes. But I couldn't detect