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modify press-on-press-off to high current

ostr1969

Dec 5, 2018
6
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Dec 5, 2018
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I have this circuit for press-on-press-off. it is working with a resistor (and led) as R11=1500ohm.
1. How can i change the circuit if i replace the R11 from 1500ohm to 8 ohm?
2. the press on press off works only in low frequency, how can i change the capacitor or other part to work on higher rate.led.PNG
 

AnalogKid

Jun 10, 2015
2,884
Joined
Jun 10, 2015
Messages
2,884
2. If by low frequency you mean that it takes too long for the circuit to reset itself for the next button press, decrease R1 and R2 to 47K each and see how that works for you.

1. Check the 5551 data sheet for continuous collector current, and compare that to the calculated collector current with the change to 8 ohms. For long-term reliability, you want the actual current to be less than 50% of the datasheet value.

ak
 
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