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I recently bought a Realistic Lab 800 magnetic cartridge Turntable at an Estate sale for $4.00.( I know it is not a high end turntable,but for the moment I thought it would serve my needs just fine!) I was told it was never used and it looks like it never really was,even the plastic cover is still there over the Stylus and cartridge! They told me it went with a Realistic 800 Stereo System which was sold earlier,but that the people had no use for the turntable and wanted just the rest of the stereo!The problem is the Turntable does not have a standard AC cord but rather what looks like a DC plug that went and pluged in the back of the Realistic 800 Stereo System!The end of the plug unscrews and the 2 wires could be desoldered,so I'm think if I know the proper DC voltage
and Mil-amps,along with ground and positive,I should be able to solder
a DC Transformer of the right voltage and Mil-amps to make it work as it does have Phono plugs coming out of the back to hook into the phono
input on my Superscope Amp!Does anyone here have any ideals as to what the voltage and Mil-amps should be? Could something like this be done and properly work ok safely on any Amp with a magnetic phono input? I hate to just part out the cartridge and stylus which looks to be Audio Technica!Besides I know it is not a high end turntable,but for the moment it would serve my needs just fine on my Superscope system?What are your thoughts or suggestions?Brian
Follow Ups:
Brian:Out of genuine concern for your safety, and not out of malice...
If you have to ask these kinds of questions, you should not be attempting power supply modifications as a first project.
I would pass on the "Do it Yourself" effort (DIY) this go around, and consult with someone locally who knows about these things - an electrician or electronics repairman perhaps.
I say this because, well, there is no such thing as a "DC" transformer. You cannot "transform" DC. Although "Wall wart" DC power supplies contain a transformer, they also contain a rectifier circuit, and possibly other components such as filters to smooth out the DC.
Don't risk burning down your home over a $4 yard sale find.
Even if someone here gives you "correct" advice, there is no real way for them to adequately check your work before you energize your project.
Cheers,
Presto
Most likely you will see a small DC motor and speed regulator circuit on a PC board. Sometimes input voltage and polarity are indicated on the PC board, which should help you. If there are no markings, track connections to electrolytic capacitor across the input, which will give you polarity. Voltage should be 30-50% lower than capacitor rating. I would use 3 V first (2 batteries) and test how it works. If it does not, I would increase voltage little by little to the point at which speed is stably maintained.
Thank you so very much for your IDEAL AND HELP!!Brian
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