Justniv:
what do u mean drawing it??
whats wrong with telling u what circuit i made??
what do u need to know? what do you wanna find out from the "drawing"?
Good bye.
is anyone else can & want to help me with this issue..?
Wire your amplifier as you may see on Replay #32. Read the comment carefully. The MIC's ground (the pin connected to the metal case) is on ground (gnd).
When wired, tell us the voltages on the transistor's legs (measured against the ground). Do not connect the output of the amplifier to arduino yet.
Wire your amplifier as you may see on Replay #32. Read the comment carefully. The MIC's ground (the pin connected to the metal case) is on ground (gnd).
i did, BUT i'm using 0.1uF capacitor instead of 100nF like in the schematic.
i did not understand these comments
e) the +5V shall be decoupled with a 100uF capacitor
f) with longer cables you may connect an 1nF capacitor in parallel with the MIC
should i added more capacitors? except from C1 in the schematic?
these are the readings:
gnd/collector = 0v
gnd/base = 2.95v
gnd/emitter = 3.22v
and this is the schematic from comment #32:
100nf = 0.1uF, that is ok
should i added more capacitors? except from C1 in the schematic?
no, you must not now
gnd/collector = 0v
gnd/base = 2.95v
gnd/emitter = 3.22v
What is your power voltage?? 5V ??
How did you connect the power source? Tell us exactly. Where is the ground connected, and where is the V1 connected.
sorry it was on 3v
when it's 5v the reading are:
gnd/collector= 0v
gnd/base= 4.32v
gnd/emitter= 4.72
With V1 = 5V you have to read (measured against ground):
base/ground 4.3-4.4V
emitter/ground 5V
collector/gnd 1.0-3.5V
Is your V1 power voltage 5V or 4.72V ?
It seems you do not have the collector connected to the R1..
ok i had one bad connection, so again:
gnd/collector = 4.99~5v
gnd/base = 4.54v
gnd/emitter = 4.72
If your wiring is correct then you MUST see (V1=4.99V):
base/gnd 4.3-4.5V
emitter/gnd 4.99V <-- emitter is at the same voltage as the V1(4.99V) - they are wired together!!
collector/gnd - 1.0-3.5V <--- it depends on the transistor's gain
Check your wiring again!
Which pin is the emitter on your transistor?
Which pin is the base on your transistor?
Which pin is the collector on your transistor?
If you watch the flat face, legs down, from left. Tell me.
If you watch the flat face, legs down, from left. Tell me.
if the flat side is facing me, the left leg is the emitter, middle le=base, right leg = collector
so i connected the transistor that way that the collector is going to 5V, now i understand that the emitter supposed to go to the 5V, and the collector going to the two resistors, so now it's connected ok.
then i checked all the connection again but no change............:
gnd/collector = 4.72v
gnd/base = 4.53v
gnd/emitter = 4.99v
Try to connect a 47k resistor from base to V1 (4.99V). That may put the transistor into the working point.
If you have 50k pot-trimmer you may connect it instead the R4=47k and set the collector/gnd voltage to 2.5V. And that's it.
Tell me the legs voltages again.
Try to connect a 47k resistor from base to V1 (4.99V). That may put the transistor into the working point.
gnd/emitter = 5v
gnd/base = 4.83v
gnd/collector = 4.80v
50k pot-trimmer
= potentiometer?
i tried connecting it but gnd/collector stays on 4.72v no matter what.
and than i tried to take off the transistor entirely out of the circuit and i get very similar results:
gnd/emitter = 5v
gnd/base = 4.32v
gnd/collector = 4.72-73v
??
If you remove the transistor (voltages measured against gnd):
- the voltage on the collector point must be 0.32V with that 47k connected
- the voltage on the collector point must be 0V with the 47k resistor disconnected
- the voltage on the base point must be 3.5V with the 47k resistor connected
- the voltage on the base point must be 0V with the 47k resistor disconnected
Would you mind my asking you how do you wire the stuff?? Soldering on a piece of pcb (deadbug or manhattan style) or a solderless breadboard??
Can you shoot a photo?
Can you attach it, I cannot open it (getting ads).
hope it'll work now
https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-prn2/960234_10201053723682434_1670408958_n.jpg
The pottrimmer is not wired properly - see the schematics above. It must be wired as variable resistor. Remove the green wire going to ground.
Set the potrimmer to half (mid) position and tell me the voltages at the transistor legs again.
PS: place the pottrimer such I can see its legs. Shoot a new photo.
i removed the green wire - and now it's only the 2 blue wires, but still same reading no matter what :\ -
gnd/collector = 4.99v
gnd/base = 4.53v
gnd/emitter = 4.72v
replace the pottrimer with the 47k resistor, remove the transistor, and tell me the voltages on the C B E holes
replace the pottrimer with the 47k resistor, remove the transistor, and tell me the voltages on the C B E holes
still the same :\
gnd/emitter = 5v
gnd/base = 4.82v
gnd/collector = 4.80v