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Author Topic: pulse motor and transistor problems  (Read 13039 times)

Offline jasonspinmaster

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pulse motor and transistor problems
« on: February 08, 2008, 09:52:00 AM »
i have a problem with my circuit.
 i am using a 12 volt motor bike battery
 when i connect up the circuit, .  i am getting a pulse but the transistor is staying on any ideas

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pulse motor and transistor problems
« on: February 08, 2008, 09:52:00 AM »

Offline hartiberlin

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Re: pulse motor and transistor problems
« Reply #1 on: February 08, 2008, 10:32:12 AM »
Hi ,
try to put a 1 to 10 Kohm resistor from the Basis to Ground ofthe driver transistor.
Then it should work.

Offline jasonspinmaster

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Re: pulse motor and transistor problems
« Reply #2 on: February 08, 2008, 11:05:17 AM »
hi  i have connect up 1k to 10 k resistor from the base off the transistor to ground but the transistor is staying on

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Re: pulse motor and transistor problems
« Reply #2 on: February 08, 2008, 11:05:17 AM »
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Offline Honk

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Re: pulse motor and transistor problems
« Reply #3 on: February 08, 2008, 11:37:38 AM »
Have you measured if the transistor is broken or not?

What is the "low state" voltage output from your "555" driver circuit.
It must go lower than 0.6V or the transistor will conduct.
If the output is higher than 0.6V you could try adding a 330R resistor from the base to ground.

Another thing. A regular 555 IC is to weak to directly feed a powerful but low HFE 2N3055 transistor.
You should switch the bipolar transistor to a low Rdson mosfet. A much better solution.

One last point. Have you measured the frequency coming from the 555?
If it is set to high (>1Khz) you will have problems when using a slow big 2N3055 transistor.
It simply doesn't turn of in time. The only good solution in this case is to use a faster transistor, e.g mosfet.

Offline jasonspinmaster

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Re: pulse motor and transistor problems
« Reply #4 on: February 08, 2008, 12:18:14 PM »
the low state out put of the 555 timer is 0.0v until the sensor is blocked and then it goes up to 12v

i do not know how to messure the frequency ????

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Re: pulse motor and transistor problems
« Reply #4 on: February 08, 2008, 12:18:14 PM »
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Offline Honk

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Re: pulse motor and transistor problems
« Reply #5 on: February 08, 2008, 01:17:26 PM »
By an oscilloscope or frequency counter

Offline pese

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Re: pulse motor and transistor problems
« Reply #6 on: February 08, 2008, 01:54:34 PM »
ne 555 wil never go to 0 volt saturation.
take an dvm . aoutput to groeund . if voltage is over 0,55 volt = the transistor will conduct alltime.

If from NE555 voms out at lowes polt 0,5-1,2 volt , then use an 1n914 /41440 (4007) in serie from transitors-base to ic ( also this current limiting resistor aswell the rbe (that setfan talked about ist)
Pese

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Re: pulse motor and transistor problems
« Reply #6 on: February 08, 2008, 01:54:34 PM »
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Offline jasonspinmaster

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Re: pulse motor and transistor problems
« Reply #7 on: February 08, 2008, 03:28:04 PM »
what do you mean by  taken a dvm

Offline jasonspinmaster

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Re: pulse motor and transistor problems
« Reply #8 on: February 08, 2008, 03:35:17 PM »
when i place the black probe on negative off the battery and the red one before entering 555 timer, on pin 2 and i get a reading off 0.12.
 when i place the red probe on to the output off the 555 timer , after the 200ohms 1 wattresistor i get 9.45 volts
 

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Re: pulse motor and transistor problems
« Reply #8 on: February 08, 2008, 03:35:17 PM »
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Offline gezgin

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Re: pulse motor and transistor problems
« Reply #9 on: February 08, 2008, 07:07:54 PM »
http://www.uoguelph.ca/~antoon/gadgets/555/555.html
someting wrong in your 555 circuit, pin 6 can connect to 12V?

Offline jasonspinmaster

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Re: pulse motor and transistor problems
« Reply #10 on: February 08, 2008, 08:15:17 PM »
so what would be the best circuit

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Re: pulse motor and transistor problems
« Reply #10 on: February 08, 2008, 08:15:17 PM »
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Offline gezgin

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Re: pulse motor and transistor problems
« Reply #11 on: February 08, 2008, 09:14:14 PM »
Do you want to make optical trigerred timer circuit or "schmit trigger"
for pulse motor control?
this motor is bedini or newman's motor or normal motor?

Offline jasonspinmaster

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Re: pulse motor and transistor problems
« Reply #12 on: February 08, 2008, 09:57:17 PM »
i am looking for a circuit to fire a 2N3055 transistor,as to fire the coil, when the light of the sensor is blocked. i think the wave coming out from the sensor is a square wave so i do not need a schmit trigger
i read the web page you sent me and i have copied the large cicuit.
 i am getting a very small pulse. (which is a great sign) if a change the resistors and the cap will that put more current in to base opening up the transistor

Offline pese

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Re: pulse motor and transistor problems
« Reply #13 on: February 08, 2008, 10:23:15 PM »
what do you mean by  taken a dvm

dvm
digitalvoltmeter
analogvoltmeter
voltmeter
to read 0,7 volts or wahat you want

Offline jasonspinmaster

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Re: pulse motor and transistor problems
« Reply #14 on: February 08, 2008, 10:48:44 PM »
i am getting 0.12 volts low state out off  555 timer with the resistor

 

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