Volume and tone control - preamplifier k8084 illustrated assembly manual h8084ip-1 total solder points: 162 difficulty level: beginner 1 2 3 4 5 advanced when usin g one of o ur amplifie rs (big or s mall), you always need a vo lume cont rol and pre ferably als o a tone c ontrol.
2 features & specifications when using one of our amplifiers (big or small), you always need a volume control and preferably also a tone control. This kit comes complete with all input / output connections and potentiometers. Furthermore it is possible to amplify or attenuate the input signal. Featu...
3 assembly hints 1. Assembly (skipping this can lead to troubles ! ) ok, so we have your attention. These hints will help you to make this project successful. Read them carefully. 1.1 make sure you have the right tools: • a good quality soldering iron (25-40w) with a small tip. • wipe it often on a ...
4 assembly hints 1.3 soldering hints : 1- mount the component against the pcb surface and carefully solder the leads 2- make sure the solder joints are cone-shaped and shiny 3- trim excess leads as close as possible to the solder joint remove them from the tape one at a time ! Axial components are t...
5 r1 : 1k (1 - 0 - 2 - b) r2 : 100k (1 - 0 - 4 - b) r16 : 10k (1 - 0 - 3 - b) r17 : 10k (1 - 0 - 3 - b) r18 : 10k (1 - 0 - 3 - b) r19 : 10k (1 - 0 - 3 - b) r20 : 10k (1 - 0 - 3 - b) hint for r21 to r24 modify the resistances marked rf and ra to increase the input sen- sitivity (more amplification). ...
6 c19 : 47µ f c20 : 47µ f c21 : 220µ f c22 : 220µ f ic1 : 8p ic2 : 8p 4. Ic sockets, watch the position of the notch! Ld1 : 5mm red "power" 6. Led. Watch the polarity ! Color= 2...5 ld... Cathode construction t1 : bc547 t2 : bc557 7. Transistors c1 : 15pf (15) c2 : 15pf (15) c3 : 100pf (101) c4 : 10...
7 connect a 2 x 12v / min. 100ma transformer with power connector sk1 (e.G. Our 212007c). This is a 2 x 12v 3-wire transformer, 1 wire is the common 0 and generally of another colour. A transformer without connecting wires will be marked 12 – 0 – 12. Sk2 : input sk3 : output 10. Dual rca jacks rv1 :...
8 connect the mains voltage to the transformer; mount a 100mat security fuse in series with the transformer. Use a high-quality power cord and plug for the connection to the mains. When the transformer is live, the led will light. Disconnect from mains. Mount the ics into the socket (mind the positi...
9 13. Building into a enclosure enclosure to avoid hum, it is recommended to mount the k8084 and the transformer into a metal housing. Drill the holes for the connections and the potentiometers. Hint: you can drill the holes for the knobs or the potentiometers and mount the knob afterwards. 1 hole i...
10 14. Pcb pcb.
11 15. Schematic diagram diagram 3 2 8 4 1 tl072 ic2a 5 6 7 tl072 ic2b 4n7 c6 4n7 c5 47nf c9 47nf c10 470 µ /25- 35 v c21 c22 50klog rv1a 50klin rv3a 50klin rv2a 50klog rv1b 50klin rv3b 50klin rv2b 3 2 8 4 1 tl072 ic1a 5 6 7 tl072 ic1b 1k r3 1k r10 3k3 r14 100k r4 10k r18 10k r16 10k r20 1k r23 100k...
Modifications and typographical errors reserved © velleman components nv. H8084ip - 2007 - ed1 (rev.1.0) velleman components nv legen heirweg 33 9890 gavere belgium europe www.Velleman.Be www.Velleman-kit.Com 5 4 1 0 3 2 9 3 7 4 4 7 1.
