Episode 1189 Both a board and a schematic in one get it: www.pcbway.com... you may be interested in this also: www.pcbway.com... Be a Patron: / imsaiguy
These are pretty cool. A large white rectangle in the "empty" space would make a nice place to put simple notes. A fine point sharpie would be best. A little swipe with iso-alcohol would let you reuse the note area id you reuse the boards.
Beautiful little PCB! The only additional part needed would be a feedback capacitor across the feedback resistor, because in my experience I have found that some Opamps are unhappy without one. I use a cap of 22pF to 100pF, depending on the circuit needs. It helps prevent oscillation at MHz frequencies...
Great idea and matt finish looks good. A suggestion for the next version could be to have Berge pin connectors in parallel to a few components that can be used to short the specific component on the same board eg. The input cap for ac,dc use like the pc card jumpers. Thanks for sharing.
That is a gorgeous board! I'd be happy with that too. I tried once to put singe-pin sockets on a learning board like that, that way I could pop resistors and capacitors in and out, but never got something that would snugly accommodate all the various small-diameter component leads. I tried collated single-pin sockets; leads were always too big or too small (Mini-Mill brand). Tried cutting some DIP sockets apart (nope, large round leads deformed them after one use), and then taking the dual-leaf socket out of the plastic, that didn't work at all. The best result was square Dupont 2.54mm headers, that seemed to accommodate the widest range of lead diameters.
I’ve got some open-bottom sleeve sockets from Mill-Max and they work great for this. Get them slightly oversize and they will accommodate all common lead/pin sizes. Not for power parts though - a 3W resistor lead will wreck them. But mine came off eBay and there’s no more of that type as it was a custom part. So for anyone willing to give it a go: you have to experiment.
Quite clever and useful! Kudos! Suggestion = Pin header strips can be purchased with female sockets. Cut and solder individual sockets for each of the needed discrete component (resistors, caps, etc.) pins. Now, each component can simply be plugged in. Various component values can be tried and the whole board can be easily reused/reconfigured, without soldering. Using ZIF sockets for the op amps would be handy, too. Warning = OSH Park's black boards come with a clear solder mask. Meaning, the copper traces show through. Meaning, the face of the board is not totally black. I didn't catch this difference, when ordering from them, and the boards were quite ugly, IMO.
what brand single pin-sockets did you use? I found most of the pin sockets I tried rarely held components well, with typical lead diameters ranging from ~0.3mm to ~1mm. I have a comment here that goes into more detail.
@@bandittwothree3765 Samtec P/N = SSA-132-W-T These are segmented. I use a Craftsman razor cutter to separate them = works perfectly = no rough edges to sand off. I get the longest pins and just cut them to length. Shorter pin lengths are available. I no longer buy ready-made DIP sockets. I just use these and cut two strips to length. Therefore, I always have the proper socket in stock. I have never had any sort of problem with these sockets = I highly recommend their products. Mouser number = 200-SSA132WT = 1 stick of 32 sockets = $5.18USD.
One suggestion for another revision would be to add a resistor leading into the non-inverting input for the inverting amplifier schematic, so you can make a difference amplifier
Handling unused Op Amp pin conditions The "TI Design Guidelines for Devices with LM324/LM358 Cores (Rev. A) Section 7 - Unused Amp Connections and Inputs Connected Directly to Ground" provides good information for anyone just using one of the two op amps in a package. It shows how to protect the unused op amp with suggested pin configurations for single-rail and split-rail. With this board it is easy to put the unused op amp into a linear state with just resistor(s) and jumpers.
I wonder if you could have put the voltage divider at the top - where the power source is? Or is there a small mod to the board you could make to allow for adding a virtual ground without the "bodge resistors". I love the "self-documenting" schematic on the PCB. More people need to do that.
I bought 10 of these and they are very well made. The only complaint is that if you ac couple the input into the non-inverting amp, there's no dc path for the input bias current. I've had to add a resistor between the non-inverting input and ground whenever I want to use an input capacitor. Perhaps revision 1.1 might include the missing tracks?
Ordering from PCB way is not for beginners. Never succeded in ordering !? Wunder if they should put a 4th degree equation onto the ordering page for completing the complexity?
In school, I had a reputation for blowing up op amps. I wasn't proud of this, or particularly clumsy. I still don't know why and I DON'T CARE! But 40+ years ago,it was a big deal. What a very useful learning tool! I like your boards. If I were teaching undergrad EEs in Engr 335 (or whatever), this board would be on my list of required lab hardware. Here's a practical suggestion -- leave a little more space between Input leads -- perhaps the "distortion" is x-talk or just noise. Anyway, some of those guide holes are very close together for these fat fingers on hands that suffer from mild to moderate neuropathy. Otherwise, Primo!!!
Already patented - in several ways - early last century. Some of the teaching of military electronics patents were public-domain from the start because we the people paid for them to be invented in the 1st place.
Breadboards are nice, but sometimes this extra bit of visualisation is really useful. It allows newcomers to visualise how their circuits are diagrammatically represented.
In fairness to the video's author, he did explain why this is a superior option for beginners. Summary: you can see the schematic and test-points without the rats nest of wires to confuse the beginner, and help teach the schematics for the circuit.
