Archive for the ‘Errors’ Category:

2019-04-28 Samsung TV Remote Not Fully Functional

also FB group Building Transistor Radios 2019 Apr 28 Joe Curtis A few months ago I also bought a remote for my Samsung TV. It looked identical to my original, and the best thing about it was it’s just for Samsung so there is no setup hassles when batteries are put in – just point

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2018-09-02 Mims Mistakes In Audio Amplifier

From FB group Building Transistor Radios, 2018-09-02 I already see one mistake. On p.27, Audio Mixer. The R6 is only 1k. The voltage divider R5 and R6 will give a voltage less than 0.6 at Q1’s base, which means Q1 will not be forward biased enough and the circuit won’t work or else sound distorted.

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2017-08-07 Low Quality Goods

From FB comment There are many factors that affect price.  One part is getting things assembled by underpaid and child (illegal) labor.  Most discounters have been caught buying their goods from these illegal sweatshops, and they still turn a blind eye to these abuses.  The net result is that the quality of the components may

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2017-06-15 Capacitor Leakage Tester Ideas

I was asking about very old capacitors and their shelf life on FB vintage test equipment group.  The guys tell how good the old capacitor testers are because they have the “magic eye” to check for leakage. I was thinking that it would be easy to test any capacitor for leakage.  All that’s needed is

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2017-05-21 22-120 Power Schematic Errors

Posted to FB group 2017 June 8, then a copy here. I found this Radio Shack power supply on Bama.edebris.com.  Looks like someone drew it up.  I found a few boo-boos, one being the LED having a 100k current limiting resistor.  It’s not going to be bright. I wonder if BK1 thermal breaker is capable

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2016-10-18 FM Transmitter Uses Power MOSFET

I watched this YouTube video where the author shows his FM transmitter using a big 60 volt power MOSFET. He also shows a very readable photo of the schematic. The video was made several years ago in 2012. He is powering this transmitter by connecting it to eleven 9 volt batteries in series, totalling 99

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