I'd hold the test until I got some protection in place if I were you, but maybe you like toast better than me. The Peterson company introduced the first commercial handheld electronic tuner for musicians, the Model 70, in 1964, and later its models of strobe tuners. I've seen poor design before, and I would've put a zener across their power supply if this thing turns out to work at all.Įdit: the 470 ohm resistor will drop sufficient voltage at only 9mA total, and each IC draws an average of at least 10mA, so that's the explanation why it lasts. I doubt any other version or type would stand 25V (for very long). If you Google the IC and take a look at a pdf datasheet you'll see an image of the IC. If you connected those caps to ground or in parallell it could explain the overload. The resulting total capacitance is thus half of each section (5 uF) and it also becomes a bipolar capacitor (meaning it can stand Alternating Current). That makes it a series connection of the two 10uF caps. In the diagram the wires are only connected to the upper two terminals, nothing to the common terminal. If you disconnected the ground wire and measured infinite resistances to the frame then that (together with the other equal resistances) is a good sign that the motor is ok. i'd like to be able to confirm if the motor is alive or dead if anyone has any tips for that, or any other reccomendations. In any case, if anyone could point me in a good direction that would be great. i don't really know what it should look like or if it could be frying transistors. on the scope the signal looks like a spike up and then down. The other thing i'm not sure about is the signal coming in from the tuning circuit. however bot coils are not open and have the same inductance so i'm not certain how to confirm that its dead. What i'm considering now is either that the motor is dead. with the motor board removed everything is stable and seems good. StroboClip (SC-1) has the same tenth-of-a-cent accuracy as its big brother models. i can't really make any voltage reading on the motor board because it seems like it would start a small fire. everything else on that board seems to be just fine (although i'm not too sure about how to test the flipflops properly but all three share the same resistance readings). Extremely precise tuning of any audio instrument. tried replacing them but they just toasted again. For sale by retired pro musician: Peterson mechanical strobe tuner, model 400. the MJE711 was burnt out and the 3.3ohm resistors were testing high. Naturally i began looking at the motor control board. the motor lookls like its trying to turn over but just moves about a quarter inch but does not spin. the strobe lights are on and respond to an input. Re: Peterson Strobe Tuner (Model 400) Reply 1 on: July 15, 2018, 11:05:10 pm The rectifier diodes, one is 1,000PIV like a 1N4007 for the +400VDC, and the 50VDC 4-diode bridge is another 1A affair so I would put a 1-2A 200PIV part like 2KBP002M (2A 200PIV) Given the age of the tuner, I would check for a shorted electrolytic capacitor in the power supply or motor. the power supply seems to be giving the right voltages. here's whats going on and what i know.Įverything seems to work except the motor. i'm trying to get a broken peterson strobe tuner model 400 working again and have hit a bit of a wall. It’s a bit pricier than others in its class, but you know how the saying goes.Hi everybody. Above all, this tuner excels in its most important function: precise intuitive strobe tuning that’s void of glitch and accurate to +/. Not only that, the StroboStomp HD can operate in true-bypass or buffer mode, which is a nice feature if you’re running a large family of pedals and/or using a super-long cable. If you use a variety of tunings and/or different instruments, imagine how convenient it would be to have all your tunings grouped and at the ready, and with a separate color assigned for each. Navigating through and tweaking the expansive tuning presets (which include 135 “Sweetened” tunings, which correct inherent tuning issues with instruments), display settings, and other features can be done through the pedal’s pair of stealthy side switches, but the StroboStomp HD also houses a micro-USB port for customizing and making firmware updates via Peterson’s free web-based software. The level of customization is what really sets the StroboStomp HD apart. The bright and clear LCD monitor is one of the nicest I’ve seen on a pedal-so much so that one could easily be fooled into thinking it’s possible to switch over to the football game when not in tuning mode. I’ll spare the “built like a tank” language for the company’s new StroboStomp HD, but this is one really robust pedal that feels like a high-tech mini-brick. Over the course of Peterson’s 70-plus years in business, they’ve rightfully earned a pretty stellar reputation for their strobe tuners, well known for high-level accuracy and solidity.
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