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froumy,
I put the magnetic phono preamp in front of the inputs to the Powered speakers for times when you need more amplification. I use an old video/audio switcher (no active components) to select my probe to either direct input to the powered speaker or into the mag pre-amp, depending on how much amplification I need.
As far as the magnetic phono preamp unit, you can get one of these from MCM for about $10. I found both of mine at the thrifts stores that seem to source a lot of their stuff from old folks estates. Savers is great for that.
BTW don't diminsh the advantage of actually hearing what the signal sounds like at different points in the circuit. It really has little to do with skill level and in fact increases your skill knowing what to expect at different points in the circuit. It's just another helpful tool in your arsenal to help with those sticky weird problems where seeing the signal just doesn't give you the whole picture (pun intended).
I picked up an old Eico signal injector (we used to call them 'mosquitos') from a local parts supplier. This was an original Eico kit from the late '60s. I had one years ago & it finally fell apart. It's built into an old penlight case & runs off of 2 'N' batteries. That'll tell you how old it is.
When I need to inject a quick signal to see if things are alive, I get that simple little oscillator out & I can quickly walk my way through the circuit without worrying about accidentally hitting high voltage anywhere. The mosquito isn't grounded anywhere.
Does anyone else use one of these?
Just another little tool to help you get things done quicker. glen
I put the magnetic phono preamp in front of the inputs to the Powered speakers for times when you need more amplification. I use an old video/audio switcher (no active components) to select my probe to either direct input to the powered speaker or into the mag pre-amp, depending on how much amplification I need.
As far as the magnetic phono preamp unit, you can get one of these from MCM for about $10. I found both of mine at the thrifts stores that seem to source a lot of their stuff from old folks estates. Savers is great for that.
BTW don't diminsh the advantage of actually hearing what the signal sounds like at different points in the circuit. It really has little to do with skill level and in fact increases your skill knowing what to expect at different points in the circuit. It's just another helpful tool in your arsenal to help with those sticky weird problems where seeing the signal just doesn't give you the whole picture (pun intended).
I picked up an old Eico signal injector (we used to call them 'mosquitos') from a local parts supplier. This was an original Eico kit from the late '60s. I had one years ago & it finally fell apart. It's built into an old penlight case & runs off of 2 'N' batteries. That'll tell you how old it is.
When I need to inject a quick signal to see if things are alive, I get that simple little oscillator out & I can quickly walk my way through the circuit without worrying about accidentally hitting high voltage anywhere. The mosquito isn't grounded anywhere.
Does anyone else use one of these?
Just another little tool to help you get things done quicker. glen
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