Categories
Cymball:
The Cymball circuit includes the both Cowbell oscillators. To adjust these two oscillators you need an oscilloscope. If you don't have one you can use your computer sound card as a oscilloscope with this small software SoundCard Oscilloscope. Prepare all components before assembly. List of components:
Image | Description | Part | Value | Qty |
| Polyester capacitor (2A183J) | C1*, C4*, C5* | 18n | 3 |
| Polyester capacitor (2A103J) | C2*, C3*, C55*, C56*, C58*, C90* | 10n | 6 |
| Polyester capacitor (2A223J) | C6*, C42*, C44*, C46* | 22n | 4 |
| Polyester capacitor (2A332J) | C10*, C15*, C16*, C49*, C57* | 3.3n | 5 |
| Polyester capacitor (2A682J) | C13*, C14* | 6.8n | 2 |
| Polyester capacitor (2A152J) | C36*, C43*, C47*, C48*, C50*, C59* | 1.5n | 6 |
| Ceramic capacitor (221) | C77* | 220p | 1 |
| Polyester capacitor (2A102J) | C11*, C51*, C52*, C53*, C54* | 1n | 5 |
| Electrolytic capacitor | C12* | 100/10 | 1 |
| Electrolytic capacitor | C35* | 47/16 | 1 |
| Electrolytic capacitor | C37*, C45* | 2.2/50 | 2 |
| Electrolytic capacitor | C38*, C40*, C41* | 1/50 | 3 |
| Electrolytic capacitor | C39* | 0.47/50 | 1 |
| Electrolytic capacitor | C78* | 33/25 | 1 |
| Diode | D5*, D6*, D7*, D8*, D11*, D12* | 1N4148 | 6 |
| NPN Silicon Transistor | Q2*, Q9*, Q16*, Q17*, Q18*, Q19*, Q20*, Q25* | 2SC945 | 8 |
| PNP Silicon Transistor | Q6* | 2SA733 | 1 |
| 1/4w Carbon resistor | R3*, R10*, R55*, R83*, R87*, R104*, R108*, R112*, R119*, R124*, R126* | 22K | 11 |
| 1/4w Carbon resistor | R6*, R61*, R84*, R120*, R121*, R89* | 10K | 6 |
| 1/4w Carbon resistor | R15* | 4K7 | 1 |
| 1/4w Carbon resistor | R35*, R37*, R39*, R46*, R48*, R50* | 120K | 6 |
| 1/4w Carbon resistor | R40*, R41* | 560K | 2 |
| 1/4w Carbon resistor | R42* | 680K | 1 |
| 1/4w Carbon resistor | R43* | 220K | 1 |
| 1/4w Carbon resistor | R44* | 150K | 1 |
| 1/4w Carbon resistor | R45*, R123* | 100K | 2 |
| 1/4w Carbon resistor | R52*, R88*, R90*, R91*, R92*, R105* | 33K | 6 |
| 1/4w Carbon resistor | R53*, R166* | 1K | 2 |
| 1/4w Carbon resistor | R56*, R58* | 560R | 2 |
| 1/4w Carbon resistor | R57*, R127*, R59* | 82K | 3 |
| 1/4w Carbon resistor | R60* | 5K6 | 1 |
| 1/4w Carbon resistor | R85*, R95*, R86*, R98*, R101* | 100R | 5 |
| 1/4w Carbon resistor | R93*, R128* | 470K | 2 |
| 1/4w Carbon resistor | R94*, R114*, R115*, R110* | 39K | 4 |
| 1/4w Carbon resistor | R96*, R97*, R99*, R100*, R102*, R103* | 1M | 6 |
| 1/4w Carbon resistor | R106* | 6K8 | 1 |
| 1/4w Carbon resistor | R107*, R111*, R109*, R113* | 18K | 4 |
| 1/4w Carbon resistor | R118* | 47K | 1 |
| 1/4w Carbon resistor | R125* | 2K2 | 1 |
| 1/4w Carbon resistor | R129* | 15K | 1 |
| Trim potentiometer (254P) | TM1*, TM2* | 250KB | 2 |
| Hex schmitt trigger | U1 | 4584N | 1 |
| Dual Operational Amplifier | U3, U5 | µPC4558C | 2 |
| Potentiometer (B205) | VR2* | 2MB | 1 |
| Potentiometer (B203) | VR4* | 20KB | 1 |
| Potentiometer (A104) | VR6* | 100KA | 1 |
Montages:
 | Here's the part that concerns the Cymball. You see that there are more components than in the previous section, this is why you must be careful that you do. |
 | Assembly the resistors. If you can not find the location of a resistor, use Eagle. Solder each value one after the other. |
 | Solder TM1* and TM2*. |
 | Solder the diodes 1N4148 MAKE SURE DIODES ARE IN THE RIGHT WAY |
 | Solder polyesters capacitors |
 | Solder electrolytics capacitors MAKE SURE ELECTROLYTICS CAPACITORS ARE IN THE RIGHT WAY
|
 | Solder transistors.Do not get confused between 2SA733 and 2SC945 it is not the same transistors.
MAKE SURE TRANSISTORS ARE IN THE RIGHT WAY |
 |
Connect the power transformer. Test 4558s power supply before solder. The green dot is-15V, the red dot is +15 V (plus or minus 5%). You have the ground on the potentiometer big square pad . Always check that the four wires from the power supply is well connected.
THEN DONT FORGET TO DISCONNECT THE POWER TRANSFORMER. DO NOT SOLDER COMPONENT AS THE CIRCUIT IS POWERED ! |
 | Finally return the PCB and solder potentiometers on the opposite side of components. DO NO WRONG IN THE VALUES OF POTENTIOMETERS, ALL THREE POTENTIOMETERS ARE DIFFERENT.
|
 | Connect the power transformer. Connect your oscilloscope on R44 * as shown in the picture. |
 | Adjust TM1* up to a period of 1.85ms. If TM1* adjustment range is not large enough for this period change the value of R44 * per a resistor of 100Kohm. (supplied in kit) |
 | Then connect your oscilloscope on R45 * as shown in the picture. |
 | Adjust TM2 * up to a period of 1.25ms. If TM2* adjustment range does not allow you to get this period change the value of R45 * per 68kohm. (Supplied with the kit). THEN DONT FORGET TO DISCONNECT THE POWER TRANSFORMER. You can then go to HitHats assembly |
Follow us