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This unit is for sale!! reverb.com/item/84233830-yamaha-ps-20-with-case-vintage-keyboard-cleaned-and-serviced?

so impressive!!

Google said analog, but the only way to know for sure is to look at a service manual or to open it up.

It's a ten voice analog polysynth. I have one. It isn't divide down. Similar to the cs

Groovy

Analog or digital? I'm confused. It has no strings and requires external power. How is it not digital?

People think the Korg Volca Beats is meant to sound like a 808, but personally I think it sounds like these, earlier Korg machines.

thank you for not talking richard. nice machines

impressive work man, it is so good to be true

The red LED needs about 1.5 to 1.6 volts to turn on and conduct. Below that, the LED does not conduct so it doesn't discharge the capacitor all the way. Standard silicon diodes need about 0.6 to 0.7 to turn on. It varies by the type of diode or LED. Since you have an o'scope, you could pick a higher value of resistor and show the charge and discharge curve of the capacitor and resistor combination. Pick values that will give a time constant of one or two seconds and a slow sweep speed on the scope.

This astable oscillator circuit reminds me of something unusual I learned to do years ago after studying the internals of the 555... For a great 555 timer circuit that ALWAYS puts out a 50% duty cycle.square wave (many say that the astable 555 output is always higher than 50% D.C.) and has a single-pot frequency control, you can use the standard 555 astable mode with a simple mod: Just discard the resistor that goes from pin7 to Vcc and connect the other end of the resistor that goes from pins 2 and 6 to pin 3 (output). Pin 7 is NC. This lets the cap charge through equal value resistance to upper and lower trigger points. Of course you will use a pot in place of the resistor, to vary the square wave frequency. You can also INDEPENDENTLY adjust the output amplitude by varying Vcc (and pin 4). The variation of amplitude and frequency does not effect the square wave duty cycle. The frequency, in Hz, is given by 1/1.39 RC, where 1.39 comes from 2 ln2. I am pretty sure the frequency formula is correct from my derivation, but I am now going by memory. Use a CMOS 555 so pin 3 goes rail-to-rail. --dAle

Good ol' Forrest...

µ is a Greek letter mu, which stands for micro, not pico. µF is microfarads. pF is picofarads.

I owe Forrest a lot too...got all his books when they came out....glad I was able to speak with him several times...once I called him, and he said he was just reading one of my articles (it was either RADIO ELECTRONICS or CIRCUIT CELLAR)!!! also had some conversations with Don Lancaster! I'm really glad I got into electronics. --dALe

I started with the original book, before radio shack broke them into separate books, at around age 10 yo. (1978) I still have it. I ended up getting a masters degree in electrical engineering, and am still going strong with a 40 year career, as of this year. I guess I owe Forest a lunch or something, if he is still with us.

Hey... Is there any access to James Rabbit music currently? I have 2-3 albums but I think I need more. Any help or direction is greatly appreciated.

You have a slight wow and flutter problem.

Would not a piezo-polymer speaker create better acoustics than a piezo-speaker made of Quartz or Barium Titanate?

Why not build an entirely mechanical phonograph player using a piezo transducer for the stylus which will be wired to the piezo speaker's diaphragm. The stylus will be quartz or barium titanate and the speaker will be piezopolymer. - - - - - - The turntable will be connected to a flywheel inside the chassis which will be rev'ed up from gears to an external crank. A continous transmission will be used to control the Tempo. . . . . . . HOW'S THAT FOR A NOVELTY ITEM?

The board you are removing from the keyboard is commonly called a Keyboard encoder. Different keyboard models will have a different key layout, so each pin combination will output a different character/symbol to a different keyboard. USB keyboards also have these encoders inside of them and the keyboards I've played with have a row of 8 pins and another row of 8 pins, all of which can connect together, there isn't just one row of "ground" pins. I built an arcade machine a while back, and I was trying to work out how to make the arcade switches interface with the PC. You can buy special keyboard encoders for about $50, or pull apart a keyboard, map out each of the pin combinations and find out the best combination for the arcade buttons so no key blocking will occur. (google keyblocking!) I went with the latter option as I was on a budget, but I wouldn't recommend it! It's very time consuming and you end up with a mess of wires. I easily spent about 150 hours mapping out keys, labeling wires, finding blocking combinations, soldering connections, etc.

That's nice it's would be a VCR Hacked tape...

I want to know how to make a membrane adding the numbers and some letters so i can control a karaoke software..i can send the picture so you know what im tallking about...

Youre an amazing person your just great

Cool video but ur not very musical no offense lol

i actually found what i wanted to know, but besides that you re incredibly slow, boring and unwatchable...

Very good.. lol

nice video dude. loved it

yay!

Cool video. I went to radio shack today to get one. The guys there said they had never heard of it. I've bought them there before. They would'nt help me find it. I felt like I was in Walmart. They would'nt even look it up. The website says that store has them in stock too. Going back to fling it in there stupid faces.

Dude! Don't take it down :) Awesome video, very helpful for me! Thanks for making this :)

@mrshiz111 i found it useful!

@mrshiz111 There's just so much WRONG with this video that I'd hate to see someone screw up perfectly good parts trying to reproduce your marginally useful result.

@LightsGoneWild funny. i would take this down, but it seems to steadily get hits, good feedback, and be useful to people

@mrshiz111 Try cutting the first 8:33 out and it will be perfect. Seriously.

I love this, but doesn't that foam distort the sound of the contact mic a bit? could i just use some electrical tape (applied somewhat heavily) to the contact mic instead of using the foam?

Good video , thnx for sharing

@mrshiz111 is your dare shirt worn ironically? and... I taped my contact mic to the bottom of a drumhead and play my Kalimba on top of the drum and it sounds magnificent. The drum/ table/ or any other solid surface adds loads to the acoustic properties plus you simply rock the kalimba or gently push in on the drumhead for vibrato.

Excelent!

@floozies thank you ;)

@ANGELIK900922 that's a kalimba, or "thumb piano". There are other names but those are most common.

what's the name of the thing you have amplified, that sounds like a marimba or xylophone?

Freeeeaky! I love it!

Great video.

Very awesome! I use Flash / ActionScript everyday and wish I could incorporate it like you did in Live. If only... IF ONLY.... everyone had live installed on their computers, this would make it so much easier to add real-time audio effects like reverb, delays, and pitch changes. It's possible to do these things within Flash with the Sample_Data event for Sound objects, but I mean... come on... Live does it so much better and CPU efficiently! Again, very neat setup! Would love a list of APIs used

@mrshiz111 no. the vid was good. It was kind of a relief to watch a yt vid with nothing pseud 4a change. I can get dejourno supreme pizzas from the local Skagway Shack but a one buck piezzo transducer? that's somethin' else. I'll take a look. man, u made that thumb pianno sound tremendous. it's a good accompaniment for poetry performances and stuff like that. anyway thanks for the info.

u cN SEE UR RESTING ON THE T KEY!LOL GREAT JOB.!

@L0GAN811 Yes you can. I think so, at least. Why not try?

Awesome, thanks!

could you use this as a throat mic?

Nice video. I'm making a plate reverb which is why I'm checking out piezo mic's. One tiny correction - solder does conduct,so things don't have to be in direct contact for current to flow, it's good if parts have a physical connection, wires wound around each other etc. but not absolutely necessary. I learned a few useful things here, also from the comments below, so thanks.