Ugly Nora wrote:Maybe his business model is selling the cassette player over and over when they break ?
if its anything like my module, i dont think its gonna "burn out" the motor. The motors run off say a 9V battery, so the unit takes the CV and regulates it to 0-5V. I don't see how that's gonna hurt the motor? Don't see how that could hurt the tape in any way either.
Constant changing of the motor speed on a motor that is made to run at one relatively consistent speed could burn it out? I am not the most mechanically inclined, but when i showed the video to an engineer friend that was their first concern.
I really don't know, but from light reading dc motors in normal use have their speed adjusted by changes in the voltage. assuming the om-1 (or in my case a euromodule) regulates the voltage so that its in the safe operating range of the motor I don't see how there could be any problem. the guy who built my module included a modded walkman, where he simply added an input jack attached to the motor. look like the walkman that comes with the om-1 already has a speed control input. i would be interested to know if i could use the om-1 with other dc motors as well, i don't see why not. but that would be way under using the capabilities of the om-1, i've just been on a "hey lets control this and that with the modular "
There are fixed speed control DC motors and those would be the ones to avoid. They usually do speed changes with gearing. Most DC motors are fine (for examples, look at cordless tools with speed control on the trigger). Walkmans usually have a fast forward (though sometimes that is just mute and play speed...which is annoying) and that at least usually moves the tape 2x faster; unless that is done with gearing, which I have seen I swear, then that speed is done via voltage for fastforward. The trick would be to coordinate the voltages CV to the speed of the cassette player pitch wise. Probably a lot of math to figure that out and there could be variance between players.
This one has a 1.9v DC motor. Don't know what kind...anyway, the gears are just for torque and to gear down the speed for tape playback. The fast forward and play both use the same switch to move the motor (that doing looking thing) https://www.instagram.com/p/BIBM1UDggOo/
Last edited by lordgalvar on Mon Jul 18, 2016 6:02 pm, edited 1 time in total.
-Ring Mods!
"I make you chocolate"
-comesect69-via-Majin Buu-by-way-of-Dirge/mtl.asm and special consideration from CA Anderton
lordgalvar wrote:There are fixed speed control DC motors and those would be the ones to avoid. They usually do speed changes with gearing. Most DC motors are fine (for examples, look at cordless tools with speed control on the trigger). Walkmans usually have a fast forward (though sometimes that is just mute and play speed...which is annoying) and that at least usually moves the tape 2x faster; unless that is done with gearing, which I have seen I swear, then that speed is done via voltage for fastforward. The trick would be to coordinate the voltages CV to the speed of the cassette player pitch wise. Probably a lot of math to figure that out and there could be variance between players.
that's the real beauty of that gieskes module. it has a neat circuit so you can use a keyboard/ribbon synth etc to get 1v/oct tracking with the speed changes. Lets you dial in different ranges etc. way over my head how it works, and you have to prepare the tape by recording a test tone on one channel, with the audio on the other channel. really cool
The little walkman I just posted on IG has a d6650 speed control ic. Which looks like it takes a wide range of input voltages and outputs the correct voltage for the cassette to play at normal speed. That would have to be bypassed (but there is a trimpots that comes off pin 1 that probably adjusts the fine). I'm guessing most cheap ones will have to bypass this to get a wide range of speeds. This ic also probably helps keeps speed constant as batteries discharge.
No ICs in the preamp section though...kinda surprised!
Also looks like this board was used in a lot of different walkmans...there are addition DC input holes and stuff on the pcb that are unused.
Hmmm...maybe I will wire up the broadcast to it....
-Ring Mods!
"I make you chocolate"
-comesect69-via-Majin Buu-by-way-of-Dirge/mtl.asm and special consideration from CA Anderton
lordgalvar wrote:
Hmmm...maybe I will wire up the broadcast to it....
DO IT also what's IG?
here's the walkman gieskes sent, i'm guessing the mod just attaches the wires from the motor...he mentions a certain type of walkman to use but that might have just been to do with how easy they were to open up and get at the board haha. that other walkman already has a dc input
actually.......here is his how to on the walkman
[youtube]http://www.youtube.com/watch?v=mVVtDNtrkbc[/youtube]
lordgalvar wrote:Instagram. https://www.instagram.com/p/BIBSHlLgWHQ/ 10 min running a walkman motor rated at 1.6v at 9 and 18v off my cioks. Nice hum while I clean the house.
I didn't think Monday would be me trying to see how long it takes to burn out a schedule motor.
ahh, instagram. cool i'll check that out, never really spent any time there. the line voltage used was another issue with the gieskes, you plug in a wall wart to the module, and he suggests best results were around 7.5V for his module..otherwise it might heat up or something. i'm using a variable power supply and never tried anything other than its 7.5v setting.
Ran it for 1 hr 30 min...it was fine (over 1 hour at 18v). Motor didnt even get that hot. Tried to play a tape at 18v motor speed...friction was too much as it was pushing tape faster than the head could let pass...so it unwound the tape. I think the cassette players will be fine unless you let in run for 200 hours continuously or something.
-Ring Mods!
"I make you chocolate"
-comesect69-via-Majin Buu-by-way-of-Dirge/mtl.asm and special consideration from CA Anderton
lordgalvar wrote:Ran it for 1 hr 30 min...it was fine (over 1 hour at 18v). Motor didnt even get that hot. Tried to play a tape at 18v motor speed...friction was too much as it was pushing tape faster than the head could let pass...so it unwound the tape. I think the cassette players will be fine unless you let in run for 200 hours continuously or something.
Good to know
On this module anyways, the incoming voltage from the wall wart is plugged into the module and a regulated 0-5V I believe, signal is output to the Walkman from another jack. Then you can modulate that signal in different ways from the other sections of the module. The heat in this case was referring to the module itself, and doing whatever it does with the line voltage, I guess. Actually I'm not sure what the regulated voltage output max is, his other modules swing 10v...probably depends on the CV source and maybe the incoming line voltage
"
also what's IG?
