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Transcript
T-SCREAMER TS9 TS808 datasheet version 19/05/16 www.op-electronics.com TS9 and TS808 The only difference between TS9 and TS808 is with R16 and R17 resistors: TS9 R16=470 R17=100K TS808 R16=100 R17=10K Transistors Original units came with 2SC1815 but since T1 and T2 stages are only buffer circuits transistors don't play a crucial role on sound here. Schematic and kits come with 2N5088 and can't be replaced with 2SC1815 straight forwardly because of different pinouts. 2N5088 could be replaced with any NPN bjt, like 2N3904 or equivalents, just pay attention to pinout. IC JRC4558D is the standard chip for this circuit but it's worth a try experimenting with other dual opamps too, like TL072, TL082, TL062, MC1458 etc. Any dual opamp will do the job and may contribute to deliver a different sound. GAIN MODS Basically the gain of the DRIVE stage is given by DRIVE+R7/R8, so when the pot is full up the opamp gain will be around 120 and 10 when full down. Change the value ratio above and you will get different gain numbers. The most straight forward approach is to use a 1M pot in place of 500K for DRIVE control, this will double the gain of the stage still preserving Tube Screamer sonic character. BASS BOOST Pick a higher value for C5 to increase bass frequency response or solder a jumper in place of C5 for even more bass boost. Connect a switch between C5 cap if you want to make the boosting switchable: CLIPPING DIODES By default T-Screamer board allows you to use a switch to select between symmetrical and asymmetrical clipping configuration. Use 1N4148 diodes for D1, D2, D4 and connect a switch into ASYM pads: ASYM SYM Real Tube Screamer units come with no switch of course and use symmetrical clipping configuration. SELECT CLIPPING WITH ROTARY SWITCH Not connected 1N4148 4. BOOST 3. SYMMETRICAL 1N4148 1N4148 2. ASYMMETRICAL 1N4148 1N4148 1N34 1. GE-SI hybrid SYMMETRICAL 1N4148 A 3P4T switch is shown in the picture, of course a SP4T is enough Picture above is an axample of a clipping diodes arrangement we tested: 1st position is a hybrid germanium-silicon clipping configuration. 2nd is asymmetrical with 3 silicon diodes 1N4148 3rd is symmetrical with 2 silicon diodes 1N4148 4th unconnected With 4th T-Screamer will behave like a regular clean booster. Other 3 positions will help select between different tonal shapes, each of them owing its distinct character. We tried other types of PN junction devices in there and this is our report: – – – – – don't use LEDs, they have none or little effect on sound different germanium diodes sound much the same, the same goes when trying the base-emitter junction of a germanium transistor as a diode with 2 ge diodes the output level drop is too high, that's why the ge-si hybrid we tried zeners with good result, it's worth a try experimenting with them we didn't try FET but it would be worth testing them Qty 1 1 1 6 5 1 1 3 1 2 1 1 2 1 2 1 1 1 1 2 1 2 1 1 1 1 Value Package 100K-A 16MM 100K/10K 0204/7 100nF C050-025X075 10K 0204/7 1K 0204/7 1M 0204/7 1N4001 DO41 1N4148 DO35 1uF E2,5-6 1uF NP E2,5-6 20K-B 16MM 220 0204/7 220nF tantalium C050-025X075 22nF C050-025X075 2N5088 TO92 4.7K 0204/7 JRC4558D DIL08 470/100 0204/7 47nF C050-025X075 47uF E2,5-6 500K-B 16MM 510K 0204/7 51K 0204/7 51pF C050-025X075 ANY COLOR LED SPST SPST T-SCREAMER partlist Parts VOL R17 C9 R3, R4, R5, R6, R10, R15 R1, R9, R11, R13, RLED R18 D3 D1, D2, D4 C10 C3, C8 TONE R12 C6, C7 C1 T1, T2 R8 IC1 R16 C5 C2, C11 DRIVE R2, R14 R7 C4 LED ASYM Description POTENTIOMETER RESISTOR CAPACITOR RESISTOR RESISTOR RESISTOR Rectifier Diode Fast Switching Diode POLARIZED CAPACITOR BIPOLAR ELECTROLYTIC CAPACITOR POTENTIOMETER RESISTOR POLARIZED CAPACITOR CAPACITOR NPN Transistor RESISTOR DUAL Op Amp RESISTOR CAPACITOR POLARIZED CAPACITOR POTENTIOMETER RESISTOR RESISTOR CAPACITOR LED TOGGLE SWITCH