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That sounds high for a minimum guaranteed datasehet, but I’ll take your numbers at face value. To do even better I’d use some CMOS logic based circuit because that will be miles better regarding power consumption.

About Us Advertise Contact Us. Note how the suggested by OP resistor values aren’t that well chosen.

Glade it worked for ya. The purpose of R8 is to make sure Q4 is off when not being explicitly driven. Let’s say now B-E is mV. R8 is only to turn off Q4 when it is not being actively driven on.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. That results in I can’t find a relacement or equivilent.

I’d round down to the next common value of 2. Anyone know where I can pick up one of these bad boys? Something in the 2. Each transistor being on keeps the other on. That shorts the base of Q1 to ground, turning it off. 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.


Figure another mV for Q4 when saturated, leaving 2. Now you dayasheet to go back and update the min required current sink value for Q1, and ripple thru all the downstream calculations from that as shown above. That means a total of at least 1. When Q1 is off, Q2 is off, which then does not try to turn on Q1. The lowest voltage drop for such a LED would be 1.

Changing R2, R3 will make the latch work or not. Once you understand what each part does, you’ll be able to find acceptable values for them yourself. Soldered it in and voila, works perfectly. I found the trigger latch circuit: The LED D1 is used as an example of a load.

Thanks for the feed back. First, let’s see how much current Q1 needs to sink when on. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

latch – What is the difference between the circuits? – Electrical Engineering Stack Exchange

Email Required, but never shown. The minimum R7 current is now 1. Looking for Germanium Transistor for Rovio.

The load is a unspecified LED emitting visible light. Instead of just poking at random values and asking what difference they make, stop and actually think about the circuit.

Picked up a dozen just in case from a guy on ebay. The main job of Q1 is to turn on Q4, so it can power the load. Home Questions Tags Users Unanswered.


2SA1273 Datasheet, Equivalent, Cross Reference Search

Q1 and Q2 are arranged with positive feedback so that they have two stable operating points. When SW1 is pressed for a little while, Q1 is turned on.

Here is the datasheet URL for this transistor. Hey all, I’ve been trying to figure out why one of my Rovio’s motors only spins one way.

Looking for Germanium Transistor for Rovio

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have datashet our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Let’s say we used 2. Jax edited the first few lines “removed that is” 22sa1273. Q2, Q4 is 2SA Please post the readings and I’ll try to help you find a replacement. With R4 of 5.

So now you datashert be able to see for yourself what a good range of values for the resistors are. I would therefore use 3. Log in to post comments. For that you’d have to follow what is shown here and properly fill in all the assumptions like the beta of the transistors. Also from what I’ve read, Ge transistors datasheer prone to eairly demise. Hope this helps you out. I think that for both sets of resistor values the latch will work. The circuits very likely will work but I would not say either circuit in the question is “well designed” or very “robust”.