help with surf pi, trying to make it work!!

[pavlos_x]

sorry wronggggggg ) its +5.07 7660 pin 8

[ApBerg]

-3.07v and along blue line is -3.07v. i detect iron in 3-5cm. it must be something wrong, shouldn't it be -5v on blue line ?

just made some checks at boards I have.....must be around -4.7 volt.

so again remove all IC's and disconnect the coil.. now insert the ICL7660 and check the bleu tracks for -4.7 volt..... this has to be fixed before you can go for the next step..
Also look at the current that is taken from the batt's... no more than some mA .

If ok then insert IC 555 and connect the coil, now again look at the current ..must be not more the 50 mA... the coil is the part that is the current eater...

[pavlos_x]

just made some checks at boards I have.....must be around -4.7 volt.

so again remove all IC's and disconnect the coil.. now insert the ICL7660 and check the bleu tracks for -4.7 volt..... this has to be fixed before you can go for the next step..
Also look at the current that is taken from the batt's... no more than some mA .

If ok then insert IC 555 and connect the coil, now again look at the current ..must be not more the 50 mA... the coil is the part that is the current eater...

with 7660 on the voltage is -4.3v in all the blue line points
1.9mA is without any ic's on the pcb, with7660 is 39mA and with 555 is 63.3mA, coil doesn't make any difference on the amps

[ApBerg]

with 7660 on the voltage is -4.3v in all the blue line points
1.9mA is without any ic's on the pcb, with7660 is 39mA and with 555 is 63.3mA, coil doesn't make any difference on the amps

Think the current from 39mA with only the 7660 inplace is to high, can be the 2n3906 is giving problems...( this was in the past +volts..) also the -4.3 is a bit low so now thinking the 2n3906 needs replacing....take it out and see what happens to volt and current...(leave the 555 out)

Wow this is like a crime story.....friends correct me if I am giving the wrong advice...

[porkluvr]

Maybe a little late for this, but as I looked over Silverdog's PCB I noticed some areas where his circuitry does not match any of my existing schematic drawings.

Would somebody please post a schematic that shows the (Silverdog) Surfmaster PI?
That's what this is all about... right?

I imagine there might be more than one version but I don't have any 't all.

[ApBerg]

longboard schematic

Maybe a little late for this, but as I looked over Silverdog's PCB I noticed some areas where his circuitry does not match any of my existing schematic drawings.

Would somebody please post a schematic that shows the (Silverdog) Surfmaster PI?
That's what this is all about... right?

I imagine there might be more than one version but I don't have any 't all.

Schematic for longboard at Silverdogs website ..

http://www.silverdog.co.uk/shop/imag...ematic1_2A.JPG

[pavlos_x]

sorry apBerg i made some mistakes, now that i look at them the measures are
1.9mA is without any ic's on the pcb, with7660 is 41mA and with 555 is 43mA, with coil is 77mA.

now am gona take out 2n3906 and lets u know.

[pavlos_x]

ok now without 2n3906 i have with 7666 1.9mA(41mA before) and i have the desirable voltage -5.08V !!!!!!!!!!

[pavlos_x]

i found that all of these transistor are equivalent to 2N3906

http://alltransistors.com/crsearch.p...=100&caps=TO92

whats your opinion.
this they have am sure ( BC307A) is that good?

[6666]

Are you trying to replace the bc327 with a 2n3906 ?

[pavlos_x]

its the other way around, trying to replace 2N3906 with an equivalent one.

[6666]

I would give a BC307A a try, just get the pins right, test it before you put it in the pcb, I assume you are replacing Q1.



BC307A Transistor Datasheet. Parameters and Characteristics.

Type Designator: BC307A

Material of transistor: Si

Polarity: pnp

Maximum collector power dissipation (Pc): 300mW

Maximum collector-base voltage (Ucb): 50V

Maximum collector-emitter voltage (Uce): 45V

Maximum emitter-base voltage (Ueb): 5V

Maximum collector current (Ic max): 100mA

Maximum junction temperature (Tj): 125°C

Transition frequency (ft): 130MHz

Collector capacitance (Cc), Pf: 6

Forward current transfer ratio (hFE), min/max: 125MIN

Manufacturer of BC307A transistor: SIEMENS

Package of BC307A transistor: X10

Application: Low Power, General Purpose







2N3906 Transistor Datasheet. Parameters and Characteristics.

Type Designator: 2N3906

Material of transistor: Si

Polarity: pnp

Maximum collector power dissipation (Pc): 310mW

Maximum collector-base voltage (Ucb): 40V

Maximum collector-emitter voltage (Uce): 40V

Maximum emitter-base voltage (Ueb): 5V

Maximum collector current (Ic max): 200mA

Maximum junction temperature (Tj): 135°C

Transition frequency (ft): 250MHz

Collector capacitance (Cc), Pf: 5

Forward current transfer ratio (hFE), min/max: 100MIN

Manufacturer of 2N3906 transistor: NSC

Package of 2N3906 transistor: TO92

Application: Medium Power, General Purpose

[pavlos_x]

''test it before you put it in the pcb''

how?

2N3906 is ebc and BC307A is cbe? they are both the same shape so BC307A goes the other way around yes?

[pavlos_x]

just made some checks at boards I have.....must be around -4.7 volt.

so again remove all IC's and disconnect the coil.. now insert the ICL7660 and check the bleu tracks for -4.7 volt..... this has to be fixed before you can go for the next step..
Also look at the current that is taken from the batt's... no more than some mA .

If ok then insert IC 555 and connect the coil, now again look at the current ..must be not more the 50 mA... the coil is the part that is the current eater...

another mistake apberg, i had bought a bc307a thinking that 2n3906 has gone bad and when i changed it i put it other way around, now that is in the right direction we have the right readings, -4.7v in all blue line, 2.9mA with 7660 only, 9.1mA with 7660 & 555, and 51.6mA with 7660, 555 and coil.

now i try to adjust it but its hard, when i do it detects in 5cm. is there another problem somewhere?


2N3906 is ebc and BC307A is cbe? they are both the same shape so BC307A goes the other way around yes?

[pavlos_x]

some help please? this thing is totally unstable