More From Ko Tilman

Schematics 1 (revised) By Ko Tilman
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A beginners book in electronics, ment for my You Tube viewers and everyone interested in electronics. Informative and useful to make a first start in electronics. Also useful for more experienced... More > people. With many schematics and illustrations (the content is extensively described in the preview on the Lulu website).This book is a revised version from a book under the same title, issued in 2008.< Less
3-7 Watt audio amplifier (TDA 1519 A or 2N3055 transistors) with tone control By Ko Tilman
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This document (20 pages, PDF file) describes a stereo amplifier, made with the TDA 1519 A Chip or with 2N3055 transistors (conventional amplifier with an output capacitor). Also the schematics from... More > two tone control units (a presence/loudness filter and a parallel T filter) are published. With these filters you can create the type of sound that you like in your audio system. The document refers to a series of video's on my Youtube channel (called: "developing a 6 (4) Watt stereo amplifier"), the circuit in this video is published here. The tone control/parallel T filter only works with 1 switch, so there is no separate control potentiometer for "low" and "high" frequencies. The amplifiers need a good quality loudspeaker box (with some bass boost) to show their good properties. The document does not supply a schematic for a power supply with which the amplifier can be connected to the grid (110-230 V - 50/60 Hz).< Less
2-10 MHz Shortwave receiver and 1 transistor VFO's By Ko Tilman
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Text: English. A schematic from a simple 5 transistor Shortwave receiver, usable for receiving broadcasting stations on frequencies between 2 and 10 MHz. Also 2 VFO schematics are given to make this... More > radio function properly. Though not designed for this purpose, tips are given to receive SSB and radio amateur stations with the help of a BFO (beat frequency oscillator). Please make the following textual adaptations to the text: A) page 25 the VFO signal is injected into the emitter B) page 35 remove the sentence "like the 2N2219" and C) page 43: NPN=PNP (BD 140).The schematics are all correct.< Less
Schematics 2 : Audio Amplifiers and Loudspeaker Boxes By Ko Tilman
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A book (English language) about audio circuits: pre amplifiers, active and passive audio filters, a mixing circuit, power amplifiers, Chip amplifiers, loudspeaker boxes, cross over circuits. Much... More > attention is payed to good practice (and pitfalls) in home brewing audio amplifiers. Like proper ground wiring, shielding, earth faults, ground loops, hum, properties of a power supply, etc. Ment for people who want to make their own audio system from scratch and don't want to have problems in engineering. Approx. 44 schematics and 45 illustrations.< Less