#1790

[@lmamakos]

The boards looks nice... with the schematics on there. But what really steals the show is the IMSAI Dog logo in the corner! Really well done! Woof!

[@DonaldBarnett2014]

If only this kind of thing were available 50 years ago I'd be genius now! 😊 So great that you are helping the youth of today with this stuff. Big thumbs up to you sir.

[@paulperano9236]

I made a board with trim pots for the resistors so you can pre-set the bias values etc then plug in your BJT and check the config, tweak it suit your needs. Uses a 6pin socket so you quick remove and put in a different BJT. Also available in PCBWay.

[@IMSAIGuy]

I couldn't find it. what is it called

[@hardrocklobsterroll395]

Dang! Scooped by the man himself. Was just talking to a friend about building something similar for a science class

[@krellft]

Built similar back in the early 80's for our Students for their experiments, at our University ... veroboard in a case ... they're very handy, even today for DIY Electronics ...

[@Lou-KI5FTY]

Nice board and thanks for doing this. One request - could you try and keep the boards under 100mm. These boards are $32 without shipping because of the size, otherwise they would have been $5.

[@Duckariffic]

$10....even $15 I'd buy....NOT $32....im very sad........... Can you break it into 2 different more cost effective boards????

[@mbak7801]

The price did put me off but if you think about it. All the circuits are standard. Just use Kicad and do a similar board but smaller. Use a different logo of course but the idea is great. Maybe silk screen "Created by inspiration from IMSAI Guy".

[@chriswalford4161]

@@mbak7801: But you lose the dog!

[@andymouse]

Your Opamp boards you designed did look nice in the Matte Green...cheers.

[@IMSAIGuy]

I love the matte green and black. A bit spendy though

[@mr1enrollment]

if you rev the board I would suggest R to gnd on the input of the switch circuits. especially the darlington etal

[@KeritechElectronics]

A nice and simple demonstration board. Kinda like Evil Mad Scientist's 741 and 555 kits, should be a lot of fun to learn electronics on. My personal quirk would be to use trimpots for at least the most important resistors in the circuits, making it possible to change parameters and observe how it affects the performance.

[@dimBulb5]

Good excuse to buy a cheap decade resistance box 😊

[@60plus01]

Thanks for many good videos. You have learnt me so much that I even can imagine what is happening just by looking at the circuit.

[@Enigma758]

Very nice! I have a question that's always nagged me about the "simple" configuration. I know it's a "common emitter" configuration, but the load can be configured in two ways (which is true for an "open collector" configuration). 1- One way is to put the load directly in line with the collector which is often done to drive a motor or an LED. In that case it is non-inverting. 2- However, another configuration is to place the load as a branch off of the collector. In that case it is inverting. Are there specific names to distinguish these two "simple" configurations?

[@IMSAIGuy]

Not that I know of

[@SilvaD702]

Clicked your pcbway link, clicked add to cart, signed up, total $52.77

[@IMSAIGuy]

you can choose cheaper shipping. I do sometimes

[@saturn5tony]

Wow a superb way to teach transistor theory, as well as the opamp,1 as,well ! Nice design 😮

[@portblock]

Its like you are Forrest Mims but in hardware! I love these. I have actually spun up a few basic boards so I dont have to wireup from scratch when prototyping

[@gamerpaddy]

the darlington part has vcc written on ground?

[@IMSAIGuy]

oops

[@jamescollier3]

Cool. on my phone, but going upstairs to order. Mosfet next? 😊

[@tripplefives1402]

Very similar, unless you bring up mosfet driver stuff. Most of those will work as is if you swap the BJTs out for mosfets.

[@davidharms3562]

Thank you for these PCB’s and Videos 👍🏻

[@Edisson.]

Hi Imsai and Imsay the dog, those PCB's are so beautifully done they would make fancy pictures for a workshop wall - that is, in addition to their functionality - a great idea for teaching electronics - one functional example will cost 10 professional articles. 👍 That dog logo is beautiful - the first thing I noticed 😁 Just a question - why is Vcc written at Darligton near the ground 🤔 Nice day 🙂🙂 Tom

[@IMSAIGuy]

vcc and ground always travel in pairs. 😉

[@tripplefives1402]

You only need the fancy tools when you start working with RF or audio. You can't really diagnose AC stuff with a multi-meter. You just need a function generator and any random oscilloscope.

[@pvc988]

Very nice little board. We were taught analog electronics using boards not dissimilar to these in my high school. JFETs next? Then MOSFETs? IGBTs?

[@robinbrowne5419]

Having 2 meters is great for measuring voltage and current at the same time. And battery powered ones are convenient because of no common ground issues. Even I know that. I use mine all the time for my LED experiments. Lol.

[@SeanBZA]

Beginner even the cheapest Horror Fraught meters will work, and a 9V battery and battery clip with leads also works well as power supply.

[@kpnconsulting8739]

Sweet! You're a one man Radio Shack. I don't need the board but I'd like a copy of the silk screen artwork: it's a nice little reference.

[@IMSAIGuy]

I added a silk screen image on the PCBway page.

[@snakezdewiggle6084]

So its a rip-off of the Radio Shack learner's kit. circa 1970 - 1990. Instead of Solder Pads, they used Spring Terminals to grip the legs of components, and wires. Day 1, Elec Tech Engineer. We were handed pcb's like this, until I pointed out the solder mask was inverted... Didn't make any friends that day.

[@copernicofelinis]

...aaaand who's a good boy?

[@robinbrowne5419]

Yup. And he wants a treat. Not some old circuit board. Lol.

[@Neverforget71324]

Why didn't they have these when I was going to school???

[@igormorozov6801]

7:40 little helper )

[@RasoulMojtahedzadeh]

You don't need an additional negative power supply in order to bias a common base configuration 😎

[@IMSAIGuy]

true, unless you want the base ground.

[@RasoulMojtahedzadeh]

@@IMSAIGuy Not really! Just imagine a regular common emitter circuit of NPN BJT that has two resistors as voltage divider at base, connect the base to ground with a capacitor, connect the input signal with a capacitor to emitter, and the output will be from collector. In this configuration you just need a positive voltage as usual 😊

[@IMSAIGuy]

we are saying the same thing.the DC potential at the base in not zero. it is in my circuit.

[@IMSAIGuy]

the common base transistor in the casode circuit is exactly as you describe

[@ElectroAtletico]

Well....a nice simple oscilloscope for under $100 sure comes nice.

[@erikburman530]

This is annoying. I just yesterday ordered two of your boards. I could have ordered this board to if I had known. Trying to save on postage by combining projects.

[@bayareapianist]

I don't understand the point. Back in 80 when CAD software systems were in $1M+, this was a a great idea. Now, when you get them for free, why bother? It's much faster to build and do simulation in software then doing all these things manually. Don't get me wrong please. It's good to touch and make hardware stuff but for learning and building some schematic, the CADs are priceless.

[@IMSAIGuy]

my point is kids seem to treat CAD like a video game and get very proficient very fast. Unfortunately many never seem to understand the fundamentals though. I interviewed a new EE PhD and asked him to draw a common emitter amplifier. he told me "you would think with my degree I could do that. I cannot" Also, some people who just like to tinker are turned off by spice.

[@robinbrowne5419]

Would you mind posting a nice image of the IMSAI Dog artwork. IMSAI Dog is pretty well everyone's favourite KZbin dog 🐕.

[@IMSAIGuy]

github.com/imsaiguy/ImsaiDog

[@robinbrowne5419]

Oh nice. - Beautiful painting by an amazing artist. - Cool photo. - Nice drawings by ImsaiGal. I like imsaidog 3.jpg the best. It looks like he is programming the computer :-) PS - I found him on KZbin as a puppy in 2020. IMSAI Guy video 647b entitled IMSAI Dog. Thanks, Robin Browne Ottawa, Canada

[@robinbrowne5419]

@@IMSAIGuy IMSAI Dog as a puppy in 2020. kzbin.info/www/bejne/hHbVY6Kpe9eljMUsi=Vq7sl0VhIDRV80bR

[@IMSAIGuy]

Hadn't watched that in some time. His white patch on the nose was really bright then.

[@larrybud]

Ok, I love your videos, but please for the love of God, hold whatever you are filming still so we can see it better!

[@jamesgarrard4361]

Thank IMSAI guy M0GZV