Voodoo Main Discussion

[ivconic]

For those who still want to make pcb; this is by now the latest version:

[SilverSurfer17]

Did you ever figure out what resistor to use on r66 for a 8ohm speaker i think thats why my speaker got hot ?

[surfdetector]

Did you ever figure out what resistor to use on r66 for a 8ohm speaker i think thats why my speaker got hot ?

See post #414

[ivconic]

Did you ever figure out what resistor to use on r66 for a 8ohm speaker i think thats why my speaker got hot ?

Speaker is getting hot?
What about 2N3904 transistor?
Is it getting hot too?
If not; than replace the speaker.
If yes; than replace R66 33R with 47R to 100R.
Pick value that cools down the transistor and yet to keep audio volume at acceptable level.
Bare speaker on the table will always sounds weaker than when is mounted in a box.
I got impression that audio is too loud and therefore R66 can be of higher resistance.
Best to fit individual hearing is to mount speaker in "resonant" enclosure, box, and than to adjust R66.
Sometimes it takes 10 omhs more or less to cool it down completely or to burn it totally.
That's why is always better to use higher resistance speakers; 16-64 ohms.

[dfbowers]

[ATTACH]54191[/ATTACH]

Hmm. Haven?t tried just two triggers but the polarity of the main clock is inverted to start with... so I added the 3rd trigger to have an odd number and flip it back. Maybe it doesn?t matter?

[SilverSurfer17]

Im only wanting to use the 8 ohm because of its size the 50 ohm speakers are huge and the 8ohm is waterproof also the 8 ohm is more of a tweeter for higher pitched sounds like beeps the cone was crushed a little when i got it and they are sending another one so ill try changing the resistor and use the new one i dont want to even connect it back to the board again thanks for the help my book should be here by Thursday so i can check all the wave forms and adjust the trimmers

[SilverSurfer17]

I found some thats only a 1/2 inch bigger then the 1 inch 8ohm ill do some looking around at old speakers i got and try those with the stock resistor and see what happens with those

[SilverSurfer17]

I tried another 8 ohm speaker turned it on got a 4 second beep left turned on for a minute and only slightly warm so i guess the speaker was bad so one problem solved

[SilverSurfer17]

Thanks for the advice on changing the speaker being brand new that would of been the last thing i checked

[SilverSurfer17]

Does anyone know if they make a pcb for the lcd rheostat so you can mount it without having to worry about breaking the legs off or do you have to use that blank breadboard and build one same with the volume control ?

[SilverSurfer17]

What part of this forum do i ask questions about coils like has anyone messed around with multiple coils as in instead of using 1 15inch coil using like 5 3 inch coils is there a spot on this forum for people who try odd ball stuff or like if you want to move faster and detect instead using one head unit with one coil 3 head units with 3 coils so you have more coil covering the surface area so you can move faster use smaller coils cover more ground and still detect small items

[Altair]

Hmm. Haven?t tried just two triggers but the polarity of the main clock is inverted to start with... so I added the 3rd trigger to have an odd number and flip it back. Maybe it doesn?t matter?

Don,
two or three triggers rely on where they are connected to main PI clock. if the main PI clock is get from Q1 collector, only two trigger are enought, if I don't wrong.

[SilverSurfer17]

Got my display going temporarily until i decide what color i want to light it up here is the common blue

[ivconic]

Why you put giant resistors all over the pcb?
No need for that.

[Qiaozhi]

Why you put giant resistors all over the pcb?
No need for that.

I was also wondering the same thing, as he previously said:

"I bought all the best parts I could that digikey had waterproof 5 pin male and female for the RG58U coax all gold contact ic dip sockets all gold test points multi colored screen waterproof push buttons and switch the best caps and resistors I?m at about $240 so far lol I want to make it so whoever just sees it asks about it let alone begs to use it"