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    Electronics Hobby Magazines

    Ever since I was 14 years old I have been an avid reader of electronics hobby magazines. Today, 66 years later, there seems to be only one left Nuts and Volts (N&V). A couple of years ago they changed from monthly to bi-monthly issues. Anyway, I'm wondering if there are other electronics...
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    Simple JFET Switch Question

    I need a switch circuit to control a diy circuit using a 12v supply voltage. Current is modest at a max of 100ma. The control signal is a 0-8v pulse at a frequency of 50-400 hz. I'm thinking a JFET circuit because I don't want to load the source signal and I also want about a one second turn...
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    TDA2030a Amplifier I.C. Specs

    The spec sheet for the subject IC has two specs for gain, open loop and closed loop. The closed loop gain has a min=25.5 dB, typ=26dB, max=26.5 dB. The open loop gain is 80dB typical, no min or max specified. I'm confused why the closed loop gain has such a narrow range. I interpret that to mean...
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    Audio limiter to quiet loud radio commercials

    I have an internet radio who's volume gets annoyingly loud during some commercials and I am trying to figure out a simple way to automatically reduce that volume. The output of the radio goes to an amplifier via a standard headphone jack on the radio. So inserting a limiter of some kind in that...
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    Boiler thermocouple voltage monitor

    I was planning on using the ADC input of an esp8266 microcontroller to monitor the voltage of my gas boiler's thermocouple. My main question is safety. How can I connect to the thermocouple without a safety issue. For example, if some failure happened that applies voltage to that thermocouple it...
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    TDA7297 cascade channels?

    I have an inexpensive Chinese TDA7297 module that I want to use to replace the audio output stage of an old car radio. The problem is that the module does not have enough gain. The radio is mono and the module is stereo so I was wondering if I could cascade the channels to get more gain...
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    1970 Delco Radio Repair - audio distorted

    I'm trying to repair a 1970 GM am/fm car radio that plays pretty well on both bands, but the audio distorts at high volume levels. I have two questions: 1. Could this distortion be normal? It sounds pretty good at moderate volume but when volume is at the top say 15% of it's range it distorts...
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