Slow down Mirage Tremolo

[highway31]

Hi,
I would like to change the minimum speed a little.
Where should I start in the circuit diagram?
R15/R16 or R17/speed potentiometer?
Thanks a lot
Jochen

 

[vigilante398]

I would recommend starting with R15/R16 and adjusting them to taste.

 

[Tassieviking]

I am curious how you would slow it down, more resistance to ground ???

Naturally I noticed that if I used an ON-OFF-ON switch I could make it a 3 speed switch by adding a resistor from the unused leg (3) of the switch to ground

I noticed that the Valve Wizard said you can replace R10 and C10 with a red LED that will blink in time with the tremolo in his article on on the phase shift tremolo. He also mentions changing the capacitor values to change speed.

The Valve Wizard- Tremolo Oscillator

 

[highway31]

Thanks a lot for the information

 

[highway31]

R16 is for the slow speed and R15/R16 parallel are for the high speed?

 

[SamuelG]

I am curious how you would slow it down, more resistance to ground ???

Naturally I noticed that if I used an ON-OFF-ON switch I could make it a 3 speed switch by adding a resistor from the unused leg (3) of the switch to ground

I noticed that the Valve Wizard said you can replace R10 and C10 with a red LED that will blink in time with the tremolo in his article on on the phase shift tremolo. He also mentions changing the capacitor values to change speed.

The Valve Wizard- Tremolo Oscillator

Ooh… you tempt me to keep modding! Stop it! My time and finances can’t keep up!!

 

[highway31]

Ooh… you tempt me to keep modding! Stop it! My time and finances can’t keep up!!

 

[Tassieviking]

R16 is for the slow speed and R15/R16 parallel are for the high speed?

If you find that this is correct,will you please let us know ?
If you work out the best resistors for fastest and slowest I would be interested in what you find.
I am thinking of building mine with a 3 position on-off-on switch and adding another resistor across tab 1 to 3 on the switch.
1: R16 and R15 in parallel
2: R16
3: R15 and new resistor in series, and those 2 resistors in parallel with R16

I might change R16 to 620k, R15 to 120k and the new resistor to 560k (across the switch 1-3).
That would give me :
1:100.54k
2: 620k
3: 324.31k

I think the lowest resistance should be 100k according to what I have read.
I traced the circuit quickly and I came up with this:

 

[highway31]

If you find that this is correct,will you please let us know ?
If you work out the best resistors for fastest and slowest I would be interested in what you find.
I am thinking of building mine with a 3 position on-off-on switch and adding another resistor across tab 1 to 3 on the switch.
1: R16 and R15 in parallel
2: R16
3: R15 and new resistor in series, and those 2 resistors in parallel with R16

I might change R16 to 620k, R15 to 120k and the new resistor to 560k (across the switch 1-3).
That would give me :
1:100.54k
2: 620k
3: 324.31k

I think the lowest resistance should be 100k according to what I have read.
I traced the circuit quickly and I came up with this:

Wow, thanks a lot for the information!