Я4С-89
The Я4С-89 is a plug-in for Soviet 7000-series clones which contains a pulse generator. It is intended for use with the sampling plugins in a similar manner to the Tek S-52 pulse generator head. It can free-run or take a 5 V external trigger signal.
The pulse outputs require an external pulse shaping cable in order to be useful. The cables contain a 1И308К 50 mA tunnel diode.
From the top, the connectors are:
- external 5 V (TTL) trigger in
- sync output, variable level and polarity
- positive-going pulse output
- negative-going pulse output
The buttons are:
- manual trigger
- external trigger mode
- period 1/0.1/0.01 ms
- delay 25/50/100/200 ns (can be added by pressing multiple buttons)
- pulse width 0.01/0.2 μs
The rotary controls are:
- external trigger level
- period vernier
- sync output amplitude, negative-zero-positive
- delay vernier
- pulse width
then two screwdriver bias adjustments for the positive-going and negative-going pulse outputs.
The connectors are СР50-73 type, which are almost compatible with BNC connectors but the latch is a tight fit and the centre contact can be unreliable.
Key Specifications
| Period | 10μs to approx 15 ms, or external trigger |
|---|---|
| Post-trigger delay | 0 to approx 400 ns |
| Rise time | Depends on external pulse shaper |
| Pulse width | 10 ns to 10 μs in two ranges |
| Trigger output amplitude | −5 V to +5 V into 1 MΩ, −1 V to +1 V into 50 Ω |
| Pulse output amplitude | 200 mV or 400 mV depending on pulse shaper |
Links
Pictures
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Front
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Threequarter view
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Pulse shaper cables schematic
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Top trace trigger output, bottom trace + pulse output, pulse length set to 10ns. Note initial positive bump to trigger tunnel diode, then big negative spike 10ns later to switch it off.
