Mimimum base current for 2N3055

Started by Anonymous in sci.electronics.design7 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.


Coil driver simulation and questions

Started by Anonymous in sci.electronics.design2 years ago 11 replies

Could some electronics guru here please clarify the following. I did a SPICE simulation of a coil driver. A simple astable multivibrator @...

Could some electronics guru here please clarify the following. I did a SPICE simulation of a coil driver. A simple astable multivibrator @ 150 KHz provides the signals @ the bases of two 2N3055 BJTs. The collectors of each 2N3055 is tied to a coil. The coil is bifilar, with the common node connected to a 15 V DC source. Each inductor of the coil has value of 0.075 uH. The emitter of ea...


OT: Power BJT Power Limit

Started by Cursitor Doom in sci.electronics.design2 weeks ago 52 replies

Gentlemen, Taking the 2N3055 as an example (as I'm sure we're all familiar with this once-ubiquitous decades-old device) say if you were to...

Gentlemen, Taking the 2N3055 as an example (as I'm sure we're all familiar with this once-ubiquitous decades-old device) say if you were to rig up some apparatus which enabled you to flood its case with a stream of say liquid helium, how much power could you wring out of it? I don't mean theoretically, I mean *practically* taking into account its real-world limitations. Any idea? Thanks...


Help Please -- very strange oscillator problem

Started by Anonymous in sci.electronics.design3 years 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 ...


online Chinese flyback with driver assemblies questions

Started by Jon I in sci.electronics.design9 months ago 10 replies

Since my dual 2N3055 driven flyback power supply was accidentally thrown away, I was pondering building another until coming across subject...

Since my dual 2N3055 driven flyback power supply was accidentally thrown away, I was pondering building another until coming across subject mentioned assemblies. They're on eBay and elsewhere. Looks like various drivers with flybacks. Example: https://tinyurl.com/y4lzxt85 Questions would be: 1) Do these have built in diodes? I DO want to be able to drive a HV multiplier. 2) Perfor...


single transistor oscillator

Started by Vivek N in sci.electronics.design7 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.design4 years 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.design5 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...