Thanks Mark. Any recommendations for a fairly simple circuit to control a Maxon 110189 motor? My electronic skills are quite limited and although I received from you and others the article and circuit for your control circuit, I wouldn't mind starting with something a bit simpler. Thanks
Relevant to the title if not the rest of the thread's content, I just found this phot on my hard drive.
It's a PP KT88 power supply for a Garrard 301. I built it about 15 years ago and ran it for a while before going on to other things. Can't remember what happened to it, probably pulled it apart because it was taking up space.
Last edited:
View attachment 292367
Relevant to the title if not the rest of the thread's content, I just found this phot on my hard drive.
It's a PP KT88 power supply for a Garrard 301. I built it about 15 years ago and ran it for a while before going on to other things. Can't remember what happened to it, probably pulled it apart because it was taking up space.
Puts me in mind of the Valradio Osc / amps that they used to make to drive synchronous capstan motors on tape machines to give variable pitch. four 807s if I remember.
Reference suly
Hello! should the LM385-1.2v reference have a negative (-9v) supply. My controler works but have reversed polarity where the motor is connected.
Thanks, Kenneth
The voltages I quoted are for the supplies.. You will need a separate reference which could very easily be derived from one of the supplies, I'd recommend an LM385-1.2V reference, a 10T pot for each speed, and a switch to select speed. The LM385 is a shunt reference and can be run off of the 9V supply using a series resistor..
Hello! should the LM385-1.2v reference have a negative (-9v) supply. My controler works but have reversed polarity where the motor is connected.
Thanks, Kenneth
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Source & Line
- Analogue Source
- Tube power supply for turntable