3 transistor mini amplifier for 9 Volt only suitable to amplify beep signals demo and schematic скачать в хорошем качестве

3 transistor mini amplifier for 9 Volt only suitable to amplify beep signals demo and schematic

Please read the description first, for the best and most complete information. A 3 transistor audio amplifier, only suitable to amplify “beeps” or “clicks”, when they are in the order of 1 Hertz up to (say) 5 KC (perhaps even higher). Not usable to amplify pur audio or music. Too much distortion will be heard in that case. Thus it is a “bare” Opamp-like 3 transistor schematic and everything is told in the video. Feel, of course, free to elaborate more on this circuit. I am sure you can get it working as a properly working (very small output) audio Amp. This is not the aim here, like I tell in the video: there are many properly working audio amplifiers (1-15 Watt, with schematics and their tests) on my YouTube Channel. The output electrolytic capacitor was in this case 220 uF/16 Volt, but 100 uF or a smaller value also works. With the switch (blue dot in the drawing) in the emitter lead of one of the end-transistors, the sound gets more fierce, but of course the current taken out of the 9 Volt battery goes (somewhat) up when a signal is amplified, thus a somewhat shorter lifetime of the 9 Volt battery, when in use. The idea was to make this amplifier in such a way that the 9 Volt battery can last for a long time, by using the class B type of amplifier to amplify the clicks/oscillations of the metal detector oscillator coil/2 transistor schematic. My You Tube channel trailer is here:    • Radiofun232 on YouTube, find working & tes...   Interested in certain electronic circuits? (Radio’s, audio amplifiers, audio pre-amps, audio filters, measuring devices to test transistors and (say) mosfets or (radio) coils or Shortwave and MW radio’s? Go to my Channel Trailer (“Radiofun232 on YouTube”).   • Radiofun232 on YouTube, find working & tes...   Type there the keywords that you like (e.g. radio/audio / amplifiers / filter / Shortwave / Short Wave /test / testing) into the “looking glass” = search function” and give “enter”. Via that you can find specific video’s (under the say 1600 published). In almost all video’s a schematic is showed, if so: it is a working and well tested electronic circuit. Keywords (again): ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in. My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there. Or https://www.lulu.com/search?adult_aud... I keep all my YT videos constant actual. Search on YT and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Upload 4 February 2026.