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About this product
Product Identifiers
BrandRainbowkits
MPNEBAO3
GTIN0040293635992
UPC0040293635992
eBay Product ID (ePID)670993088
Product Key Features
ModelEBAO-3
Ratings and reviews
Most relevant reviews
- 31 Mar, 2021
Very limited functionality, problematic manual, not good for beginners
This kit is advertised as "designed to produce a sine wave audio signal between 5Hz and 50KHz"; while this is theoretically true, the actual kit only includes parts to make an oscillator generating about 440 Hz without adjustability. The sales text says "Potentiometer R9 provides fine tuning of the output frequency by +/-15KHz", but in fact there is essentially no frequency adjustment given the components provided. The product seems aimed at beginners to electronics, yet the sales text refers repeatedly to "Wein" bridge which is a misspelling of "Wien" bridge; not so great for teaching. This might seem minor, but the entire manual that comes with the kit is full of sloppiness, confusions, and flat out incorrect information (although kudos to the kit maker for at least providing manual at all). Sales and manual text says "Output Amplitude: ~2V pk-pk (for 9V power source)", but in reality it is closer to 4Vpp, and not adjustable. The only adjustments on the circuit board allow for slight modification of the sine wave symmetry. Sales text says "Operates on 9VDC battery", but no hardware is included for connecting a 9B battery; a 2 cent 9V battery connector should be part of the kit. The waveform provided is a significantly distorted sine wave. The manual has several lapses in regards to component identification and component orientation that are likely to confuse beginners, resulting in an inoperative kit. The two LEDs supplied with my kit had NONE of the usual characteristics for identifying the polarity (e.g. notches or flats on the plastic case, different lead lengths). The circuit board has seven holes for terminal pins, but only five pins are provided, and in the form of a 5 pin header; the instructions say nothing about cutting the header up into pieces to use for this purpose, and there are two pins short of what should be there. This product could be improved by a refresh of the manual, better selected parts provided with the kit (e.g. LEDs with polarity identification). 440 kHz is an odd frequency for a signal generator; the kit could be improved by including the parts to produce the more common 1kHz frequency.
Verified purchase: YesCondition: New
- 29 Jul, 2020
Very nice!
Works very well. The specified supply voltage (9V) is nominal. The circuit works well with supply voltages in the range 7-13 VDC and I only had to readjust the waveform control to restore the sine wave shape at the lower supply voltages. With a 12 V supply and a load of about 10K, the oscillator output was about 3 VP-P, plenty for my project. Very nice! With the supplied components (R5 and R6 = 68K) the output frequency was about 450 Hz. After changing R5 and R6 to 22K, the frequency was about 1400 Hz. Again, very nice! My only complaint is that the circuit board (about 5.7 x 6.9 cm) is a little "tight" to fit easily into my project box. But, well, that is *my* problem. Still, very nice!Verified purchase: YesCondition: New
- 31 Oct, 2018
Good kit for a beginner
It was simple to build and has only one drawback, adjusting the frequency requires de-soldering and desoldering components and the pc board just won’t take much of that.Verified purchase: YesCondition: New
- 03 Jan, 2019
Tune it up
The formula given in the instruction book works as advertised. I computed what was needed for a 27khz frequency output, found necessary parts in my junk box and put it together. It worked. Scope showed a less than steller sign wave, a little flat on top and bottom of wave, but still ok. Frequency counter showed 27.3 kHz.Verified purchase: YesCondition: New
- 14 Oct, 2020
Good product good value
Good product deliver on timeVerified purchase: YesCondition: New
- 28 Sep, 2017
Good
Verified purchase: YesCondition: New
- 03 Oct, 2020
Simple oscillator that produces a clean output around 400 Hz.
Simple oscillator circuit that gave me a 400 Hz tone I was looking for to implement into another project.
Verified purchase: YesCondition: New
