@@ -14,6 +14,38 @@ r2 dann auch wirklich ein tempco sein und sowohl u$1g$3, u$1g$4 und
...
@@ -14,6 +14,38 @@ r2 dann auch wirklich ein tempco sein und sowohl u$1g$3, u$1g$4 und
r2 müssen in thermischem kontakt stehen, wie im bild hier (foto von
r2 müssen in thermischem kontakt stehen, wie im bild hier (foto von
th 555 vco diy expo)
th 555 vco diy expo)
## 2017-03-30 Build Notes
1. Take Components PCB
2. solder all 10k resistors (6 pieces) in. Careful not to confuse them with 18k!
3. solder all 18k resistors (2 pieces) in. Careful not to confuse them with 10k!
4. solder all 12k resistors (2 pieces) in.
5. solder all 2.2k resistors (3 pieces) in. Do not confuse with 2.2m or 22k!
6. solder all 100k resistors (2 pieces) in.
7. solder all 2.2m resistors (2 pieces) in.
8. solder R36 with 150k in (replace this with a different value to change PWM control scale, leave this out and add a 200k precision trimmer if you want to add the [PWM Scale Trim Mod](https://code.hfbk.net/t6/th-vco1/blob/wot/DIY_Manuals/mods/pwm_scale_trim_2.jpg))
9. solder R10 with 1M
10. solder R1 with 1k
11. solder R16 with 20k
12. solder R9 with 22k
13. solder R15 with 27k
14. solder R24 with 390R
15. solder R7 with 47R
16. solder R18 with 5.1k
17. solder R8 with 820R
18. solder R2 with 2k. (replace this with a 330ppm 2k Tempco if you use Transistors instead of the THAT340)
19. solder the two 1N4001 diodes in. Careful with the orientation! The white stripe needs to be oriented right!
20. solder D1, 1N4148 in. Careful with the orientation! The black stripe needs to be oriented right!
21. solder the 16 Pin IC sockets. Solder one leg first, solder the rest once you made sure everything is straight. Orient them right to avoid mistakes when putting the ICs in later.
22. solder the 8 Pin IC sockets. Solder one leg first, solder the rest once you made sure everything is straight. Orient them right to avoid mistakes when putting the ICs in later.
23. solder all bypass capacitors (100nF ceramic)
24. solder C1 with 1nF. Careful – do not confuse with C3!
25. solder C4 with 47pF
26. solder C2 with 10n
27. solder C3, 1n Styrofoam/Styroflex/Glimmer. (This Capacitor is for tuning and should be somewhat stable with changing temperature).
28. solder the Transistors Q3 and Q4, 2N3904. Careful to orient them according to the silkscreen.
29. solder the precision voltage reference LM4040-10.0 in.Careful to orient according to the silkscreen.
## Page 1 (Manual)
## Page 1 (Manual)
The TH-VCO1 is a voltage controlled oscillator, with a triangle Schmitt-Trigger Integrator core designed by Thomas Henry.
The TH-VCO1 is a voltage controlled oscillator, with a triangle Schmitt-Trigger Integrator core designed by Thomas Henry.
