Mimimum base current for 2N3055

Started by Anonymous in sci.electronics.design5 years ago 35 replies

Could some electronics guru please help ? What is the minimum base current for the 2N3055 ? The On Semi data sheet that I downloaded is not...

Could some electronics guru please help ? What is the minimum base current for the 2N3055 ? The On Semi data sheet that I downloaded is not very helpful. Thanks in advance for your help.


Help Please -- very strange oscillator problem

Started by Anonymous in sci.electronics.design2 months ago 34 replies

Could some electronics guru please help ? I have two identical(same resistor, capacitor values) implementations of an astable multivibrator. I...

Could some electronics guru please help ? I have two identical(same resistor, capacitor values) implementations of an astable multivibrator. I am using the 2N3055 and each transistor drives a coil each of a bifilar coil, whose common terminal is connected to a 12 Volt 2A(max) DC power supply. The coils is air core. The problem is that one implementation works as designed, the other does ...


single transistor oscillator

Started by Vivek N in sci.electronics.design4 years ago 11 replies

I tried building a single transistor LED flasher like this...

I tried building a single transistor LED flasher like this : http://cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html I didn't have the recommended 2n2222 - I tried with a BC548, 2n2369 and 2n3055 - None of them work. I'm using a trimpot set to 2 kiloohms and a 470 microfarad capacitor. Instead of a 100 ohm resistor I put 3 superbright LEDs in series. I get 1.2 v...


Type number of old Ge power transistor

Started by Pimpom in sci.electronics.design10 months ago 18 replies

Reminiscing about old transistors in another thread reminds me of something that's been nagging at me on and off for some time. In the early...

Reminiscing about old transistors in another thread reminds me of something that's been nagging at me on and off for some time. In the early days of solid-state audio amplifiers - mostly PA types - here in India, there was a *very* limited choice of power transistors. Most amps used the European Ge TO-3 type AD149. Types like the 2N3055 and 2N3773 came long after they were widely used...


Maximum switching frequency for MJE13005 ?

Started by Anonymous in sci.electronics.design2 years ago 16 replies

Could some electronics guru please help ? I am trying to find out the maximum switching frequency fro the MJE13005 ? Both the Central...

Could some electronics guru please help ? I am trying to find out the maximum switching frequency fro the MJE13005 ? Both the Central Semiconductor and OnSemi datasheets do not provide any clear information -- "high frequency switching applications" -- but how high ? I know that the maximum switching frequency forthe 2N3055 is 4.2 MHZ. Any hints/pointers/ suggestions would be helpfu...