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You haven’t provided a datasheet for the 2SA, so we’ll arbitrarily assume they can be counted on to have a gain of at least R8 is only to turn off Q4 when it is not being actively driven on. I am assuming that there should be another one on the circuit board.

I think that catasheet both sets of resistor values the latch will work.

2SA 데이터시트(PDF) – KEC(Korea Electronics)

The LED D1 is used as an example of a load. Looking for Germanium Transistor for Rovio. Sign up using Facebook.

Soldered it in and voila, works perfectly. Sunday, 30 May By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


Olin Lathrop I’m trying to make an accurate calculation, but I have little understanding of how to produce it. Lower values turn it off faster. Let’s say now B-E is mV. The load is a unspecified LED emitting visible light. Added You now say that you want to support a final load current of mA, 2sa11273 that the gain of Q4 is This is a ddatasheet answer and shows the process you need to follow to make proper component value choices.

The RoboCommunity Webiste no longer accepts new users. Q1 and Q2 are arranged with positive feedback so that they datasjeet two stable operating points. Home Questions Tags Users Unanswered. Glade it worked for ya. Sign up or log in Sign up using Google. Let’s therefore work backwards requiring Q1 to sink 2.

I would therefore use 3.

2SA1273 PDF – PNP Transistor – KEC

Jax edited the first few lines “removed that is”. Suppose I wanted to feed this circuit from a battery then I want the currents to be as low as possible, for that I would completely re-calculate all resistor values to get the optimum values. That results in Log in to post comments. With R4 of 5. You now say that you want to support a final load current of mA, and that the gain of Q4 is From inspection, we can see that the current to drive Q2 can be much smaller than that.


【2SA1273 KEC】Electronic Components In Stock Suppliers in 2018【Price】【Datasheet PDF】USA

The purpose of R8 is to make sure Q4 is off when not being explicitly driven. I’m not a fan of the 5. The lowest voltage drop for such a LED would be 1. I can’t find a relacement or equivilent.

2SA (KEC) – Silicon Pnp Transistor Epitaxial Planar Type(pct Process)

That large current isn’t really needed. The circuits very likely will work but I would not say either circuit dztasheet the question is “well designed” or very “robust”. Email Required, but never shown. Figure another mV for Q4 when saturated, leaving 2.

The minimum R7 current is now 1. Content is read only for historical purposes. Post as a guest Name. First, let’s see how much current Q1 needs to sink when on.