hello everyone and thanks
I see that both types can be used; sure we cannot find all the advantages in one type !!
Shockley Diode has high switching speed and it needs less current to switch, it can discharge the cap rapidly to near its break-over voltage which is less than the other diode like sghioto said :
But both types do not allow the capacitors to be discharged completely !!
Please two things I don't understand :
How to calculate the current pass to the base for biasing the transistor
Why this ripple is produced when the capacitor is being charged!? (red circle on your schematic)
I reproduced my schematic:
I thought that keeping the resistor R2 helps to discharge completely the cap like Audioguru said !?
Thanks
TS.
After some research i did on charging and discharging capacitors through diodes.Add a diode across the base emitter, cathode to base.
I see that both types can be used; sure we cannot find all the advantages in one type !!
Shockley Diode has high switching speed and it needs less current to switch, it can discharge the cap rapidly to near its break-over voltage which is less than the other diode like sghioto said :
Even it is used as Relaxation Oscillator !!This will discharge the cap rapidly to appx .35 volts when the button is pressed.
But both types do not allow the capacitors to be discharged completely !!
#ericgibbshi AMI,
This sim shows the current thru IC1
E
Please two things I don't understand :
How to calculate the current pass to the base for biasing the transistor
Why this ripple is produced when the capacitor is being charged!? (red circle on your schematic)
I reproduced my schematic:
I thought that keeping the resistor R2 helps to discharge completely the cap like Audioguru said !?
please I will appreciate any more helpWith the diode then the capacitor discharges through 1k resistor R2 and the diode when the button is pressed.
Thanks
TS.
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